{ "version": "2.2", "instance": { "c117115_497.htm": { "nsprefix": "cik0001084380", "nsuri": "http://TIAA.com/20250531", "dts": { "inline": { "local": [ "c117115_497.htm" ] }, "schema": { "local": [ "c497-20260720.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://www.xbrl.org/lrr/arcrole/deprecated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://www.xbrl.org/dtr/type/2024-01-31/types.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025_def.xsd", "https://xbrl.sec.gov/dei/2025/dei-2025.xsd", "https://xbrl.sec.gov/fnd/2025/fnd-2025.xsd", "https://xbrl.sec.gov/fnd/2025/fnd-2025_lab.xsd", "https://xbrl.sec.gov/fnd/2025/fnd-oef-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025_cal.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025_lab.xsd", "https://xbrl.sec.gov/oef/2025/oef-rr-2025.xsd", "https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd" ] }, "definitionLink": { "local": [ "c497-20260720_def.xml" ] }, "labelLink": { "local": [ "c497-20260720_lab.xml" ] }, "presentationLink": { "local": [ "c497-20260720_pre.xml" ] } }, "keyStandard": 74, "keyCustom": 1, "axisStandard": 4, "axisCustom": 0, "memberStandard": 3, "memberCustom": 316, "hidden": { "total": 141, "http://xbrl.sec.gov/oef/2025": 134, "http://xbrl.sec.gov/dei/2025": 7 }, "contextCount": 2119, "entityCount": 1, "segmentCount": 319, "elementCount": 530, "unitCount": 2, "baseTaxonomies": { "http://xbrl.sec.gov/oef/2025": 5934, "http://xbrl.sec.gov/dei/2025": 8 }, "report": { "R1": { "role": "http://xbrl.sec.gov/rr/role/N1aCover", "longName": "010000 - Disclosure - Form N-1A Cover", "shortName": "Form N-1A Cover", "isDefault": "true", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "1", "firstAnchor": { "contextRef": "Context_20250531_20250531", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R2": { "role": "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "longName": "010000 - Document - Document and Entity Information {Elements}", "shortName": "Document and Entity Information", "isDefault": "false", "groupType": "document", "subGroupType": "", "menuCat": "Risk/Return", "order": "2", "firstAnchor": { "contextRef": "Context_20250531_20250531", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R3": { "role": "http://xbrl.sec.gov/rr/role/RiskReturn", "longName": "010002 - Disclosure - Investment Objectives and Goals", "shortName": "Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "3", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R4": { "role": "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "longName": "010003 - Disclosure - Fees and Expenses", "shortName": "Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "4", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R5": { "role": "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "longName": "010004 - Disclosure - Investment Strategy", "shortName": "Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "5", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R6": { "role": "http://TIAA.com/20250531/role/RRCustomRiskRole70", "longName": "010004 - Schedule - Investment Risks {Unlabeled}", "shortName": "Investment Risks", "isDefault": "false", "groupType": "", "subGroupType": "", "menuCat": "Risk/Return", "order": "6", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "cik0001084380:CustomRisksTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "cik0001084380:CustomRisksTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true, "unique": true } }, "R7": { "role": "http://xbrl.sec.gov/rr/role/PerformanceManagement", "longName": "010006 - Disclosure - Performance Management", "shortName": "Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "7", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R11": { "role": "http://xbrl.sec.gov/rr/role/BarChartData", "longName": "020050 - Disclosure - Annual Total Returns", "shortName": "Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "8", "firstAnchor": { "contextRef": "Context_20241231_20241231_C000054997Member_S000019661Member_S000019661Summary1Member", "name": "oef:AnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "div", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": null }, "R47": { "role": "http://TIAA.com/20250531/role/RRDetailData2", "longName": "020102 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Retirement Income Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Retirement Income Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "9", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_S000019661Summary1Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000019661Member_Principalinvestmentrisks2_S000019661Summary1Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R48": { "role": "http://TIAA.com/20250531/role/RRDetailData4", "longName": "020104 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2010 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2010 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "10", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005375Member_S000005375Summary2Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005375Member_Principalinvestmentrisks2_S000005375Summary2Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R49": { "role": "http://TIAA.com/20250531/role/RRDetailData6", "longName": "020106 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2015 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2015 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "11", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005376Member_S000005376Summary3Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005376Member_Principalinvestmentrisks2_S000005376Summary3Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R50": { "role": "http://TIAA.com/20250531/role/RRDetailData8", "longName": "020108 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2020 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2020 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "12", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005377Member_S000005377Summary4Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005377Member_Principalinvestmentrisks2_S000005377Summary4Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R51": { "role": "http://TIAA.com/20250531/role/RRDetailData10", "longName": "020110 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2025 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2025 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "13", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005378Member_S000005378Summary5Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005378Member_Principalinvestmentrisks2_S000005378Summary5Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R52": { "role": "http://TIAA.com/20250531/role/RRDetailData12", "longName": "020112 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2030 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2030 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "14", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005379Member_S000005379Summary6Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005379Member_Principalinvestmentrisks2_S000005379Summary6Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R53": { "role": "http://TIAA.com/20250531/role/RRDetailData14", "longName": "020114 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2035 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2035 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "15", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005380Member_S000005380Summary7Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005380Member_Principalinvestmentrisks2_S000005380Summary7Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R54": { "role": "http://TIAA.com/20250531/role/RRDetailData16", "longName": "020116 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2040 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2040 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "16", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000005382Member_S000005382Summary8Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000005382Member_Principalinvestmentrisks2_S000005382Summary8Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R55": { "role": "http://TIAA.com/20250531/role/RRDetailData18", "longName": "020118 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2045 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2045 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "17", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019659Member_S000019659Summary9Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000019659Member_Principalinvestmentrisks2_S000019659Summary9Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R56": { "role": "http://TIAA.com/20250531/role/RRDetailData20", "longName": "020120 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2050 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2050 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "18", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000019660Member_S000019660Summary10Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000019660Member_Principalinvestmentrisks2_S000019660Summary10Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R57": { "role": "http://TIAA.com/20250531/role/RRDetailData22", "longName": "020122 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2055 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2055 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "19", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000031927Member_S000031927Summary11Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000031927Member_Principalinvestmentrisks2_S000031927Summary11Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R58": { "role": "http://TIAA.com/20250531/role/RRDetailData24", "longName": "020124 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2060 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2060 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "20", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000046661Member_S000046661Summary12Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000046661Member_Principalinvestmentrisks2_S000046661Summary12Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R59": { "role": "http://TIAA.com/20250531/role/RRDetailData26", "longName": "020126 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2065 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2065 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "21", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000069450Member_S000069450Summary13Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000069450Member_Principalinvestmentrisks2_S000069450Summary13Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R60": { "role": "http://TIAA.com/20250531/role/RRDetailData28", "longName": "020128 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2070 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle 2070 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "22", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000095269Member_S000095269Summary14Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000095269Member_Principalinvestmentrisks2_S000095269Summary14Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R61": { "role": "http://TIAA.com/20250531/role/RRDetailData30", "longName": "020130 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index Retirement Income Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index Retirement Income Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "23", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026499Member_S000026499Summary15Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026499Member_Principalinvestmentrisks2_S000026499Summary15Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R62": { "role": "http://TIAA.com/20250531/role/RRDetailData32", "longName": "020132 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2010 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2010 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "24", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026498Member_S000026498Summary16Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026498Member_Principalinvestmentrisks2_S000026498Summary16Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R63": { "role": "http://TIAA.com/20250531/role/RRDetailData34", "longName": "020134 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2015 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2015 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "25", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026501Member_S000026501Summary17Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026501Member_Principalinvestmentrisks2_S000026501Summary17Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R64": { "role": "http://TIAA.com/20250531/role/RRDetailData36", "longName": "020136 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2020 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2020 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "26", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026502Member_S000026502Summary18Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026502Member_Principalinvestmentrisks2_S000026502Summary18Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R65": { "role": "http://TIAA.com/20250531/role/RRDetailData38", "longName": "020138 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2025 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2025 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "27", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026503Member_S000026503Summary19Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026503Member_Principalinvestmentrisks2_S000026503Summary19Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R66": { "role": "http://TIAA.com/20250531/role/RRDetailData40", "longName": "020140 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2030 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2030 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "28", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026504Member_S000026504Summary20Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026504Member_Principalinvestmentrisks2_S000026504Summary20Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R67": { "role": "http://TIAA.com/20250531/role/RRDetailData42", "longName": "020142 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2035 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2035 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "29", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026505Member_S000026505Summary21Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026505Member_Principalinvestmentrisks2_S000026505Summary21Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R68": { "role": "http://TIAA.com/20250531/role/RRDetailData44", "longName": "020144 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2040 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2040 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "30", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026506Member_S000026506Summary22Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026506Member_Principalinvestmentrisks2_S000026506Summary22Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R69": { "role": "http://TIAA.com/20250531/role/RRDetailData46", "longName": "020146 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2045 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2045 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "31", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026507Member_S000026507Summary23Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026507Member_Principalinvestmentrisks2_S000026507Summary23Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R70": { "role": "http://TIAA.com/20250531/role/RRDetailData48", "longName": "020148 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2050 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2050 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "32", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000026508Member_S000026508Summary24Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000026508Member_Principalinvestmentrisks2_S000026508Summary24Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R71": { "role": "http://TIAA.com/20250531/role/RRDetailData50", "longName": "020150 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2055 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2055 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "33", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000031926Member_S000031926Summary25Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000031926Member_Principalinvestmentrisks2_S000031926Summary25Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R72": { "role": "http://TIAA.com/20250531/role/RRDetailData52", "longName": "020152 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2060 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2060 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "34", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000046662Member_S000046662Summary26Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000046662Member_Principalinvestmentrisks2_S000046662Summary26Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R73": { "role": "http://TIAA.com/20250531/role/RRDetailData54", "longName": "020154 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2065 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2065 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "35", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000069451Member_S000069451Summary27Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000069451Member_Principalinvestmentrisks2_S000069451Summary27Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R74": { "role": "http://TIAA.com/20250531/role/RRDetailData56", "longName": "020156 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2070 Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifecycle Index 2070 Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "36", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000095270Member_S000095270Summary28Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000095270Member_Principalinvestmentrisks2_S000095270Summary28Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R75": { "role": "http://TIAA.com/20250531/role/RRDetailData58", "longName": "020158 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Income Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifestyle Income Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "37", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000034961Member_S000034961Summary29Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000034961Member_Principalinvestmentrisks2_S000034961Summary29Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R76": { "role": "http://TIAA.com/20250531/role/RRDetailData60", "longName": "020160 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Conservative Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifestyle Conservative Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "38", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000034959Member_S000034959Summary30Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000034959Member_Principalinvestmentrisks2_S000034959Summary30Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R77": { "role": "http://TIAA.com/20250531/role/RRDetailData62", "longName": "020162 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Moderate Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifestyle Moderate Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "39", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000034962Member_S000034962Summary31Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000034962Member_Principalinvestmentrisks2_S000034962Summary31Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R78": { "role": "http://TIAA.com/20250531/role/RRDetailData64", "longName": "020164 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Growth Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifestyle Growth Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "40", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000034960Member_S000034960Summary32Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000034960Member_Principalinvestmentrisks2_S000034960Summary32Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R79": { "role": "http://TIAA.com/20250531/role/RRDetailData66", "longName": "020166 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Aggressive Growth Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Lifestyle Aggressive Growth Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "41", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000034958Member_S000034958Summary33Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000034958Member_Principalinvestmentrisks2_S000034958Summary33Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } }, "R80": { "role": "http://TIAA.com/20250531/role/RRDetailData68", "longName": "020168 - Disclosure - Risk/Return Detail Data (Nuveen Managed Allocation Fund) {Elements}", "shortName": "Risk/Return Detail Data (Nuveen Managed Allocation Fund)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "42", "firstAnchor": { "contextRef": "Context_20250531_20250531_S000012194Member_S000012194Summary34Member", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "p", "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "first": true }, "uniqueAnchor": { "contextRef": "Context_20250531_20250531_S000012194Member_Principalinvestmentrisks2_S000012194Summary34Member", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "c117115_497.htm", "unique": true } } }, "tag": { "oef_AcquiredFundFeesAndExpensesBasedOnEstimates": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AcquiredFundFeesAndExpensesBasedOnEstimates", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Acquired Fund Fees and Expenses, Based on Estimates [Text]" } } }, "auth_ref": [ "r28" ] }, "oef_AcquiredFundFeesAndExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AcquiredFundFeesAndExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Acquired Fund Fees and Expenses" } } }, "auth_ref": [ "r27" ] }, "cik0001084380_ActiveManagementRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "ActiveManagementRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_ActiveManagementRisk2Member [Member]", "terseLabel": "Active Management Risk", "documentation": "Active Management Risk" } } }, "auth_ref": [] }, "oef_AfterTaxesOnDistributionsAndSalesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AfterTaxesOnDistributionsAndSalesMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "terseLabel": "After Taxes on Distributions and Sales", "label": "After Taxes on Distributions and Sales" } } }, "auth_ref": [ "r48" ] }, "oef_AfterTaxesOnDistributionsMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AfterTaxesOnDistributionsMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "terseLabel": "After Taxes on Distributions", "label": "After Taxes on Distributions" } } }, "auth_ref": [ "r48" ] }, "oef_AllCoregistrantsMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AllCoregistrantsMember", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "All Coregistrants [Member]" } } }, "auth_ref": [ "r1" ] }, "oef_AllRisksMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AllRisksMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "All Risks [Member]", "label": "All Risks [Member]" } } }, "auth_ref": [ "r37" ] }, "dei_AmendmentDescription": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentDescription", "presentation": [ "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Amendment Description", "documentation": "Description of changes contained within amended document." } } }, "auth_ref": [] }, "dei_AmendmentFlag": { "xbrltype": "booleanItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentFlag", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Amendment Flag", "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission." } } }, "auth_ref": [] }, "oef_AnnlRtrPct": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnlRtrPct", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return [Percent]" } } }, "auth_ref": [ "r44" ] }, "oef_AnnualFundOperatingExpensesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualFundOperatingExpensesTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Annual Fund Operating Expenses [Table]" } } }, "auth_ref": [ "r34" ] }, "oef_AnnualReturnCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return Caption [Text]" } } }, "auth_ref": [ "r46" ] }, "oef_AnnualReturnColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return, Column [Optional Text]" } } }, "auth_ref": [ "r45" ] }, "oef_AnnualReturnInceptionDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnInceptionDate", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return, Inception Date" } } }, "auth_ref": [ "r44" ] }, "cik0001084380_AssetAllocationRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "AssetAllocationRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_AssetAllocationRisk2Member [Member]", "terseLabel": "Asset Allocation Risk", "documentation": "Asset Allocation Risk" } } }, "auth_ref": [] }, "oef_AverageAnnualReturnAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnAbstract", "lang": { "en-us": { "role": { "label": "Average Annual Return:" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Caption [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Column Name [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnLabel", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Label [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AvgAnnlRtrPct": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AvgAnnlRtrPct", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Percent" } } }, "auth_ref": [ "r9" ] }, "oef_BarChartAndPerformanceTableHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartAndPerformanceTableHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart and Performance Table [Heading]" } } }, "auth_ref": [ "r42" ] }, "oef_BarChartClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartClosingTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Closing [Text Block]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartDoesNotReflectSalesLoads": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartDoesNotReflectSalesLoads", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Does Not Reflect Sales Loads [Text]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartFootnotesTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Footnotes [Text Block]" } } }, "auth_ref": [ "r49" ] }, "oef_BarChartHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart [Heading]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartHighestQuarterlyReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHighestQuarterlyReturn", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartHighestQuarterlyReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHighestQuarterlyReturnDate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return, Date" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartLowestQuarterlyReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartLowestQuarterlyReturn", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartLowestQuarterlyReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartLowestQuarterlyReturnDate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return, Date" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartNarrativeTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Narrative [Text Block]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text]" } } }, "auth_ref": [ "r47" ] }, "oef_BarChartReturnsForClassNotOfferedInProspectus": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartReturnsForClassNotOfferedInProspectus", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Returns for Class Not Offered in Prospectus [Text]" } } }, "auth_ref": [ "r46" ] }, "oef_BarChartTableAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartTableAbstract", "lang": { "en-us": { "role": { "label": "Bar Chart Table:" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart [Table]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartYearToDateReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartYearToDateReturn", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Year to Date Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartYearToDateReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartYearToDateReturnDate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Year to Date Return, Date" } } }, "auth_ref": [ "r44" ] }, "cik0001084380_BloombergUSAggregateBondIndex3102Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3102Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3102Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3106Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3106Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3106Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex310Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex310Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex310Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3110Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3110Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3110Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3114Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3114Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3114Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3118Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3118Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3118Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3122Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3122Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3122Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex3126Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex3126Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex3126Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex314Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex314Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex314Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex318Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex318Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex318Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex322Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex322Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex322Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex326Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex326Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex326Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex32Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex32Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex32Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex330Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex330Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex330Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex334Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex334Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex334Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex338Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex338Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex338Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex342Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex342Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex342Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex346Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex346Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex346Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex350Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex350Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex350Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex354Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex354Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex354Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex358Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex358Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex358Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex362Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex362Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex362Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex366Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex366Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex366Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex36Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex36Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex36Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex370Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex370Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex370Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex374Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex374Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex374Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex378Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex378Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex378Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex382Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex382Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex382Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex386Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex386Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex386Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex390Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex390Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex390Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex394Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex394Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex394Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_BloombergUSAggregateBondIndex398Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "BloombergUSAggregateBondIndex398Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_BloombergUSAggregateBondIndex398Member [Member]", "terseLabel": "Bloomberg U.S. Aggregate Bond Index", "documentation": "Bloomberg U.S. Aggregate Bond Index" } } }, "auth_ref": [] }, "cik0001084380_C000014639Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014639Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014639 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014640Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014640Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014640 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014641Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014641Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014641 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014642Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014642Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014642 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014643Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014643Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014643 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014644Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014644Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014644 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000014647Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000014647Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000014647 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000033271Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000033271Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000033271 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000033272Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000033272Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000033272 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000033273Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000033273Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000033273 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047972Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047972Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047972 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047973Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047973Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047973 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047974Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047974Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047974 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047975Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047975Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047975 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047976Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047976Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047976 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047977Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047977Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047977 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000047978Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000047978Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000047978 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000054991Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054991Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054991 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000054992Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054992Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054992 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000054993Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054993Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054993 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000054994Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054994Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054994 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000054995Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054995Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054995 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000054996Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054996Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054996 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000054997Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000054997Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000054997 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079517Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079517Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079517 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079518Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079518Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079518 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079519Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079519Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079519 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079520Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079520Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079520 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079521Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079521Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079521 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079522Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079522Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079522 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079527Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079527Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079527 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079528Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079528Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079528 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079529Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079529Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079529 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079530Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079530Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079530 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079531Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079531Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079531 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079532Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079532Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079532 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079533Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079533Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079533 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079534Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079534Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079534 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079535Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079535Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079535 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079536Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079536Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079536 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079537Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079537Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079537 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079538Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079538Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079538 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079539Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079539Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079539 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079540Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079540Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079540 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079541Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079541Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079541 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079542Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079542Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079542 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079543Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079543Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079543 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079544Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079544Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079544 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079545Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079545Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079545 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079546Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079546Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079546 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079547Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079547Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079547 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079548Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079548Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079548 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000079549Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079549Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079549 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079550Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079550Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079550 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000079559Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079559Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079559 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079560Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079560Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079560 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079561Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079561Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079561 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079562Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079562Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079562 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079563Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079563Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079563 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079564Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079564Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079564 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079566Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079566Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079566 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079575Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079575Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079575 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079576Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079576Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079576 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000079577Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000079577Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000079577 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000099413Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099413Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099413 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000099414Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099414Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099414 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000099415Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099415Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099415 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000099416Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099416Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099416 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000099417Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099417Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099417 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000099418Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000099418Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000099418 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107517Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107517Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107517 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000107518Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107518Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107518 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107519Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107519Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107519 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000107520Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107520Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107520 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000107521Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107521Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107521 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000107522Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107522Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107522 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107523Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107523Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107523 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000107524Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107524Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107524 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000107525Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107525Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107525 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107526Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107526Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107526 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000107527Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107527Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107527 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000107528Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107528Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107528 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000107529Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107529Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107529 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000107530Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107530Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107530 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107531Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107531Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107531 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000107532Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107532Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107532 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000107533Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107533Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107533 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000107534Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107534Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107534 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000107535Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107535Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107535 [Member]", "terseLabel": "Class A", "documentation": "Class A" } } }, "auth_ref": [] }, "cik0001084380_C000107536Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000107536Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000107536 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000145612Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145612Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145612 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000145613Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145613Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145613 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000145614Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145614Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145614 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000145615Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145615Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145615 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000145616Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145616Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145616 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000145617Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000145617Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000145617 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000162552Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162552Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162552 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162553Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162553Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162553 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162554Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162554Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162554 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162555Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162555Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162555 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162556Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162556Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162556 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162557Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162557Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162557 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162559Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162559Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162559 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162574Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162574Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162574 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162575Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162575Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162575 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162576Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162576Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162576 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162577Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162577Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162577 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162578Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162578Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162578 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162580Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162580Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162580 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162581Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162581Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162581 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162582Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162582Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162582 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162583Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162583Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162583 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162584Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162584Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162584 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162585Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162585Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162585 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162586Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162586Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162586 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162587Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162587Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162587 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162590Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162590Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162590 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162591Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162591Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162591 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162593Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162593Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162593 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162594Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162594Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162594 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162595Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162595Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162595 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162596Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162596Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162596 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162597Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162597Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162597 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162601Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162601Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162601 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000162602Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000162602Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000162602 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000221702Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221702Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221702 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000221703Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221703Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221703 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000221704Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221704Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221704 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000221705Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221705Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221705 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000221706Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221706Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221706 [Member]", "terseLabel": "Premier Class", "documentation": "Premier Class" } } }, "auth_ref": [] }, "cik0001084380_C000221707Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221707Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221707 [Member]", "terseLabel": "Retirement Class", "documentation": "Retirement Class" } } }, "auth_ref": [] }, "cik0001084380_C000221708Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221708Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221708 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000221709Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000221709Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000221709 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000263978Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263978Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData28", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263978 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000263979Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263979Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData28", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263979 [Member]", "terseLabel": "Premier", "documentation": "Premier" } } }, "auth_ref": [] }, "cik0001084380_C000263980Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263980Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData28", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263980 [Member]", "terseLabel": "Retirement", "documentation": "Retirement" } } }, "auth_ref": [] }, "cik0001084380_C000263981Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263981Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData28", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263981 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "cik0001084380_C000263982Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263982Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData56", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263982 [Member]", "terseLabel": "Class R6", "documentation": "Class R6" } } }, "auth_ref": [] }, "cik0001084380_C000263983Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263983Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData56", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263983 [Member]", "terseLabel": "Premier", "documentation": "Premier" } } }, "auth_ref": [] }, "cik0001084380_C000263984Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263984Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData56", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263984 [Member]", "terseLabel": "Retirement", "documentation": "Retirement" } } }, "auth_ref": [] }, "cik0001084380_C000263985Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "C000263985Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData56", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "C 000263985 [Member]", "terseLabel": "Class I", "documentation": "Class I" } } }, "auth_ref": [] }, "oef_ClassAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ClassAxis", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "terseLabel": "Class [Axis]", "label": "Class [Axis]" } } }, "auth_ref": [ "r4" ] }, "oef_Component1OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component1OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component1 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "oef_Component2OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component2OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component2 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "oef_Component3OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component3OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component3 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "oef_CoregistrantAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CoregistrantAxis", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Coregistrant [Axis]" } } }, "auth_ref": [ "r1" ] }, "cik0001084380_CurrencyUnderlyingFundsRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "CurrencyUnderlyingFundsRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_CurrencyUnderlyingFundsRisk2Member [Member]", "terseLabel": "Currency Underlying Funds Risk", "documentation": "Currency Underlying Funds Risk" } } }, "auth_ref": [] }, "cik0001084380_CustomRisksTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://TIAA.com/20250531", "localname": "CustomRisksTableTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRCustomRiskRole70" ], "lang": { "en-us": { "role": { "label": "Risks [Table Text Block]", "terseLabel": "Risks [Table Text Block]" } } }, "auth_ref": [] }, "cik0001084380_DirectRealEstateUnderlyingFundsRisks2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "DirectRealEstateUnderlyingFundsRisks2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_DirectRealEstateUnderlyingFundsRisks2Member [Member]", "terseLabel": "Direct Real Estate Underlying Funds Risks", "documentation": "Direct Real Estate Underlying Funds Risks" } } }, "auth_ref": [] }, "oef_DistributionAndService12b1FeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "DistributionAndService12b1FeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Distribution and Service (12b-1) Fees" } } }, "auth_ref": [ "r19" ] }, "oef_DistributionOrSimilarNon12b1FeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "DistributionOrSimilarNon12b1FeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Distribution or Similar (Non 12b-1) Fees" } } }, "auth_ref": [ "r19" ] }, "dei_DocumentCreationDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentCreationDate", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1" ], "lang": { "en-us": { "role": { "label": "Document Creation Date", "documentation": "The date the document was made available and submitted, in YYYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different." } } }, "auth_ref": [] }, "dei_DocumentDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentDomain", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "terseLabel": "Prospectus", "label": "Prospectus", "documentation": "Type of the document as assigned by the filer, corresponding to SEC document naming convention standards." } } }, "auth_ref": [] }, "dei_DocumentEffectiveDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentEffectiveDate", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1" ], "lang": { "en-us": { "role": { "label": "Document Effective Date", "documentation": "The date when a document, upon receipt and acceptance, becomes officially effective, in YYYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases." } } }, "auth_ref": [] }, "dei_DocumentInformationDocumentAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentInformationDocumentAxis", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "terseLabel": "Document [Axis]", "label": "Document [Axis]", "documentation": "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table." } } }, "auth_ref": [] }, "dei_DocumentPeriodEndDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentPeriodEndDate", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Document Period End Date", "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD." } } }, "auth_ref": [] }, "dei_DocumentType": { "xbrltype": "submissionTypeItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentType", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Document Type", "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'." } } }, "auth_ref": [] }, "cik0001084380_EmergingMarketsUnderlyingFundsRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "EmergingMarketsUnderlyingFundsRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_EmergingMarketsUnderlyingFundsRisk2Member [Member]", "terseLabel": "Emerging Markets Underlying Funds Risk", "documentation": "Emerging Markets Underlying Funds Risk" } } }, "auth_ref": [] }, "dei_EntityCentralIndexKey": { "xbrltype": "centralIndexKeyItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityCentralIndexKey", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Entity Central Index Key", "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK." } } }, "auth_ref": [ "r0" ] }, "dei_EntityDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityDomain", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Series", "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains." } } }, "auth_ref": [] }, "dei_EntityInvCompanyType": { "xbrltype": "invCompanyType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityInvCompanyType", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Entity Investment Company Type", "documentation": "One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product)." } } }, "auth_ref": [ "r62" ] }, "dei_EntityRegistrantName": { "xbrltype": "normalizedStringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityRegistrantName", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Registrant Name", "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC." } } }, "auth_ref": [ "r0" ] }, "cik0001084380_EquityUnderlyingFundsRisks2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "EquityUnderlyingFundsRisks2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_EquityUnderlyingFundsRisks2Member [Member]", "terseLabel": "Equity Underlying Funds Risks", "documentation": "Equity Underlying Funds Risks" } } }, "auth_ref": [] }, "oef_ExchangeFee": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExchangeFee", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Exchange Fee" } } }, "auth_ref": [ "r13" ] }, "oef_ExchangeFeeOverRedemption": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExchangeFeeOverRedemption", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Exchange Fee (as a percentage of Amount Redeemed)" } } }, "auth_ref": [ "r13" ] }, "oef_ExpenseBreakpointDiscounts": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseBreakpointDiscounts", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Breakpoint Discounts [Text]" } } }, "auth_ref": [ "r25" ] }, "oef_ExpenseBreakpointMinimumInvestmentRequiredAmount": { "xbrltype": "monetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseBreakpointMinimumInvestmentRequiredAmount", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Breakpoint, Minimum Investment Required [Amount]" } } }, "auth_ref": [ "r12" ] }, "oef_ExpenseExampleAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleAbstract", "lang": { "en-us": { "role": { "label": "Expense Example:" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example by, Year, Caption [Text]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, By Year, Column [Optional Text]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearHeading", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example by Year [Heading]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleClosingTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Closing [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleFootnotesTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Footnotes [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example [Heading]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNarrativeTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Narrative [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleNoRedemptionAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionAbstract", "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption:" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionByYearCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionByYearCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, By Year, Caption [Text]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionByYearColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionByYearColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, By Year, Column [Optional Text]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionNarrativeTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption Narrative [Text Block]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption [Table]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear01": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear01", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 1 Year" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear03": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear03", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 3 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear05": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear05", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 5 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear10": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear10", "presentation": [ "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 10 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleWithRedemptionTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleWithRedemptionTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, With Redemption [Table]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear01": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear01", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 1 Year" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear03": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear03", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 3 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear05": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear05", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 5 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear10": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear10", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 10 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseFootnotesTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Footnotes [Text Block]" } } }, "auth_ref": [ "r17" ] }, "oef_ExpenseHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Heading [Optional Text]" } } }, "auth_ref": [ "r11" ] }, "oef_ExpenseNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseNarrativeTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Narrative [Text Block]" } } }, "auth_ref": [ "r12" ] }, "oef_ExpensesDeferredChargesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesDeferredChargesTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Deferred Charges [Text Block]" } } }, "auth_ref": [ "r14" ] }, "oef_ExpensesExplanationOfNonrecurringAccountFee": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesExplanationOfNonrecurringAccountFee", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Explanation of Nonrecurring Account Fee [Text]" } } }, "auth_ref": [ "r16" ] }, "oef_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesNotCorrelatedToRatioDueToAcquiredFundFees", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]" } } }, "auth_ref": [ "r29" ] }, "oef_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Other Expenses Had Extraordinary Expenses Been Included [Text]" } } }, "auth_ref": [ "r21" ] }, "oef_ExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_NetExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Expenses (as a percentage of Assets)", "totalLabel": "Total Expenses" } } }, "auth_ref": [ "r23" ] }, "oef_ExpensesRangeOfExchangeFeesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesRangeOfExchangeFeesTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Range of Exchange Fees [Text Block]" } } }, "auth_ref": [ "r15" ] }, "oef_ExpensesRestatedToReflectCurrent": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesRestatedToReflectCurrent", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Restated to Reflect Current [Text]" } } }, "auth_ref": [ "r24" ] }, "oef_FeeWaiverOrReimbursementOverAssets": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FeeWaiverOrReimbursementOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_NetExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Fee Waiver or Reimbursement", "negatedLabel": "Fee Waiver or Reimbursement" } } }, "auth_ref": [ "r26" ] }, "oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FeeWaiverOrReimbursementOverAssetsDateOfTermination", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Fee Waiver or Reimbursement over Assets, Date of Termination" } } }, "auth_ref": [ "r26" ] }, "cik0001084380_Fixed-IncomeUnderlyingFundsRisks2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Fixed-IncomeUnderlyingFundsRisks2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Fixed-IncomeUnderlyingFundsRisks2Member [Member]", "terseLabel": "Fixed-Income Underlying Funds Risks", "documentation": "Fixed-Income Underlying Funds Risks" } } }, "auth_ref": [] }, "oef_FormN1aAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FormN1aAbstract", "lang": { "en-us": { "role": { "label": "Form N-1A:" } } }, "auth_ref": [ "r2" ] }, "cik0001084380_FundofFundsRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "FundofFundsRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_FundofFundsRisk2Member [Member]", "terseLabel": "Fund of Funds Risk", "documentation": "Fund of Funds Risk" } } }, "auth_ref": [] }, "oef_HighestQuarterlyReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HighestQuarterlyReturnLabel", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] }, "cik0001084380_IlliquidInvestmentsUnderlyingFundsRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "IlliquidInvestmentsUnderlyingFundsRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_IlliquidInvestmentsUnderlyingFundsRisk2Member [Member]", "terseLabel": "Illiquid Investments Underlying Funds Risk", "documentation": "Illiquid Investments Underlying Funds Risk" } } }, "auth_ref": [] }, "oef_IndexNoDeductionForFeesExpensesTaxes": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "IndexNoDeductionForFeesExpensesTaxes", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Index No Deduction for Fees, Expenses, or Taxes [Text]" } } }, "auth_ref": [ "r48" ] }, "cik0001084380_IndexRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "IndexRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57" ], "lang": { "en-us": { "role": { "label": "cik0001084380_IndexRisk2Member [Member]", "terseLabel": "Index Risk", "documentation": "Index Risk" } } }, "auth_ref": [] }, "dei_LegalEntityAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "LegalEntityAxis", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "terseLabel": "Series [Axis]", "label": "Series [Axis]", "documentation": "The set of legal entities associated with a report." } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2010FundCompositeIndex38Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2010FundCompositeIndex38Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2010FundCompositeIndex38Member [Member]", "terseLabel": "Lifecycle 2010 Fund Composite Index", "documentation": "Lifecycle 2010 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2015FundCompositeIndex312Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2015FundCompositeIndex312Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2015FundCompositeIndex312Member [Member]", "terseLabel": "Lifecycle 2015 Fund Composite Index", "documentation": "Lifecycle 2015 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2020FundCompositeIndex316Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2020FundCompositeIndex316Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2020FundCompositeIndex316Member [Member]", "terseLabel": "Lifecycle 2020 Fund Composite Index", "documentation": "Lifecycle 2020 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2025FundCompositeIndex320Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2025FundCompositeIndex320Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2025FundCompositeIndex320Member [Member]", "terseLabel": "Lifecycle 2025 Fund Composite Index", "documentation": "Lifecycle 2025 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2030FundCompositeIndex324Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2030FundCompositeIndex324Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2030FundCompositeIndex324Member [Member]", "terseLabel": "Lifecycle 2030 Fund Composite Index", "documentation": "Lifecycle 2030 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2035FundCompositeIndex328Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2035FundCompositeIndex328Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2035FundCompositeIndex328Member [Member]", "terseLabel": "Lifecycle 2035 Fund Composite Index", "documentation": "Lifecycle 2035 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2040FundCompositeIndex332Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2040FundCompositeIndex332Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2040FundCompositeIndex332Member [Member]", "terseLabel": "Lifecycle 2040 Fund Composite Index", "documentation": "Lifecycle 2040 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2045FundCompositeIndex336Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2045FundCompositeIndex336Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2045FundCompositeIndex336Member [Member]", "terseLabel": "Lifecycle 2045 Fund Composite Index", "documentation": "Lifecycle 2045 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2050FundCompositeIndex340Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2050FundCompositeIndex340Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2050FundCompositeIndex340Member [Member]", "terseLabel": "Lifecycle 2050 Fund Composite Index", "documentation": "Lifecycle 2050 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2055FundCompositeIndex344Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2055FundCompositeIndex344Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2055FundCompositeIndex344Member [Member]", "terseLabel": "Lifecycle 2055 Fund Composite Index", "documentation": "Lifecycle 2055 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2060FundCompositeIndex348Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2060FundCompositeIndex348Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2060FundCompositeIndex348Member [Member]", "terseLabel": "Lifecycle 2060 Fund Composite Index", "documentation": "Lifecycle 2060 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_Lifecycle2065FundCompositeIndex352Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Lifecycle2065FundCompositeIndex352Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Lifecycle2065FundCompositeIndex352Member [Member]", "terseLabel": "Lifecycle 2065 Fund Composite Index", "documentation": "Lifecycle 2065 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2010FundCompositeIndex360Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2010FundCompositeIndex360Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2010FundCompositeIndex360Member [Member]", "terseLabel": "Lifecycle Index 2010 Fund Composite Index", "documentation": "Lifecycle Index 2010 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2015FundCompositeIndex364Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2015FundCompositeIndex364Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2015FundCompositeIndex364Member [Member]", "terseLabel": "Lifecycle Index 2015 Fund Composite Index", "documentation": "Lifecycle Index 2015 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2020FundCompositeIndex368Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2020FundCompositeIndex368Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2020FundCompositeIndex368Member [Member]", "terseLabel": "Lifecycle Index 2020 Fund Composite Index", "documentation": "Lifecycle Index 2020 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2025FundCompositeIndex372Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2025FundCompositeIndex372Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2025FundCompositeIndex372Member [Member]", "terseLabel": "Lifecycle Index 2025 Fund Composite Index", "documentation": "Lifecycle Index 2025 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2030FundCompositeIndex376Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2030FundCompositeIndex376Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2030FundCompositeIndex376Member [Member]", "terseLabel": "Lifecycle Index 2030 Fund Composite Index", "documentation": "Lifecycle Index 2030 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2035FundCompositeIndex380Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2035FundCompositeIndex380Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2035FundCompositeIndex380Member [Member]", "terseLabel": "Lifecycle Index 2035 Fund Composite Index", "documentation": "Lifecycle Index 2035 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2040FundCompositeIndex384Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2040FundCompositeIndex384Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2040FundCompositeIndex384Member [Member]", "terseLabel": "Lifecycle Index 2040 Fund Composite Index", "documentation": "Lifecycle Index 2040 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2045FundCompositeIndex388Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2045FundCompositeIndex388Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2045FundCompositeIndex388Member [Member]", "terseLabel": "Lifecycle Index 2045 Fund Composite Index", "documentation": "Lifecycle Index 2045 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2050FundCompositeIndex392Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2050FundCompositeIndex392Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2050FundCompositeIndex392Member [Member]", "terseLabel": "Lifecycle Index 2050 Fund Composite Index", "documentation": "Lifecycle Index 2050 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2055FundCompositeIndex396Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2055FundCompositeIndex396Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2055FundCompositeIndex396Member [Member]", "terseLabel": "Lifecycle Index 2055 Fund Composite Index", "documentation": "Lifecycle Index 2055 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2060FundCompositeIndex3100Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2060FundCompositeIndex3100Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2060FundCompositeIndex3100Member [Member]", "terseLabel": "Lifecycle Index 2060 Fund Composite Index", "documentation": "Lifecycle Index 2060 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndex2065FundCompositeIndex3104Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndex2065FundCompositeIndex3104Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndex2065FundCompositeIndex3104Member [Member]", "terseLabel": "Lifecycle Index 2065 Fund Composite Index", "documentation": "Lifecycle Index 2065 Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleIndexRetirementIncomeFundCompositeIndex356Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleIndexRetirementIncomeFundCompositeIndex356Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleIndexRetirementIncomeFundCompositeIndex356Member [Member]", "terseLabel": "Lifecycle Index Retirement Income Fund Composite Index", "documentation": "Lifecycle Index Retirement Income Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifecycleRetirementIncomeFundCompositeIndex34Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifecycleRetirementIncomeFundCompositeIndex34Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifecycleRetirementIncomeFundCompositeIndex34Member [Member]", "terseLabel": "Lifecycle Retirement Income Fund Composite Index", "documentation": "Lifecycle Retirement Income Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifestyleAggressiveGrowthFundCompositeIndex3124Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifestyleAggressiveGrowthFundCompositeIndex3124Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifestyleAggressiveGrowthFundCompositeIndex3124Member [Member]", "terseLabel": "Lifestyle Aggressive Growth Fund Composite Index", "documentation": "Lifestyle Aggressive Growth Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifestyleConservativeFundCompositeIndex3112Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifestyleConservativeFundCompositeIndex3112Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifestyleConservativeFundCompositeIndex3112Member [Member]", "terseLabel": "Lifestyle Conservative Fund Composite Index", "documentation": "Lifestyle Conservative Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifestyleGrowthFundCompositeIndex3120Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifestyleGrowthFundCompositeIndex3120Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifestyleGrowthFundCompositeIndex3120Member [Member]", "terseLabel": "Lifestyle Growth Fund Composite Index", "documentation": "Lifestyle Growth Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifestyleIncomeFundCompositeIndex3108Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifestyleIncomeFundCompositeIndex3108Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifestyleIncomeFundCompositeIndex3108Member [Member]", "terseLabel": "Lifestyle Income Fund Composite Index", "documentation": "Lifestyle Income Fund Composite Index" } } }, "auth_ref": [] }, "cik0001084380_LifestyleModerateFundCompositeIndex3116Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "LifestyleModerateFundCompositeIndex3116Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_LifestyleModerateFundCompositeIndex3116Member [Member]", "terseLabel": "Lifestyle Moderate Fund Composite Index", "documentation": "Lifestyle Moderate Fund Composite Index" } } }, "auth_ref": [] }, "oef_LowestQuarterlyReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LowestQuarterlyReturnLabel", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] }, "cik0001084380_ManagedAllocationFundCompositeIndex3128Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "ManagedAllocationFundCompositeIndex3128Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_ManagedAllocationFundCompositeIndex3128Member [Member]", "terseLabel": "Managed Allocation Fund Composite Index", "documentation": "Managed Allocation Fund Composite Index" } } }, "auth_ref": [] }, "oef_ManagementFeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ManagementFeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Management Fees (as a percentage of Assets)" } } }, "auth_ref": [ "r18" ] }, "oef_MarketIndexPerformanceTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MarketIndexPerformanceTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Market Index Performance [Table]" } } }, "auth_ref": [ "r48" ] }, "oef_MaximumAccountFee": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumAccountFee", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Account Fee" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumAccountFeeOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumAccountFeeOverAssets", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Account Fee (as a percentage of Assets)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumCumulativeSalesChargeOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumCumulativeSalesChargeOverOfferingPrice", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Cumulative Sales Charge (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumCumulativeSalesChargeOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumCumulativeSalesChargeOverOther", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Cumulative Sales Charge (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumDeferredSalesChargeOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumDeferredSalesChargeOverOfferingPrice", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Deferred Sales Charge (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumDeferredSalesChargeOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumDeferredSalesChargeOverOther", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Deferred Sales Charge (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumSalesChargeImposedOnPurchasesOverOfferingPrice", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MoneyMarketSevenDayTaxEquivalentYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayTaxEquivalentYield", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Tax Equivalent Yield" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYield", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield, Caption [Optional Text]" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield Column [Optional Text]" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldPhone", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield Phone" } } }, "auth_ref": [ "r52" ] }, "cik0001084380_MorningstarAggressiveTargetRiskIndex3123Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarAggressiveTargetRiskIndex3123Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarAggressiveTargetRiskIndex3123Member [Member]", "terseLabel": "Morningstar Aggressive Target Risk Index", "documentation": "Morningstar Aggressive Target Risk Index" } } }, "auth_ref": [] }, "cik0001084380_MorningstarConservativeTargetRiskIndex3107Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarConservativeTargetRiskIndex3107Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarConservativeTargetRiskIndex3107Member [Member]", "terseLabel": "Morningstar Conservative Target Risk Index", "documentation": "Morningstar Conservative Target Risk Index" } } }, "auth_ref": [] }, "cik0001084380_MorningstarModerateTargetRiskIndex3115Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarModerateTargetRiskIndex3115Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarModerateTargetRiskIndex3115Member [Member]", "terseLabel": "Morningstar Moderate Target Risk Index", "documentation": "Morningstar Moderate Target Risk Index" } } }, "auth_ref": [] }, "cik0001084380_MorningstarModerateTargetRiskIndex3127Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarModerateTargetRiskIndex3127Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarModerateTargetRiskIndex3127Member [Member]", "terseLabel": "Morningstar Moderate Target Risk Index", "documentation": "Morningstar Moderate Target Risk Index" } } }, "auth_ref": [] }, "cik0001084380_MorningstarModeratelyAggressiveTargetRiskIndex3119Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarModeratelyAggressiveTargetRiskIndex3119Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarModeratelyAggressiveTargetRiskIndex3119Member [Member]", "terseLabel": "Morningstar Moderately Aggressive Target Risk Index", "documentation": "Morningstar Moderately Aggressive Target Risk Index" } } }, "auth_ref": [] }, "cik0001084380_MorningstarModeratelyConservativeTargetRiskIndex3111Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "MorningstarModeratelyConservativeTargetRiskIndex3111Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_MorningstarModeratelyConservativeTargetRiskIndex3111Member [Member]", "terseLabel": "Morningstar Moderately Conservative Target Risk Index", "documentation": "Morningstar Moderately Conservative Target Risk Index" } } }, "auth_ref": [] }, "oef_NetExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "NetExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Net Expenses (as a percentage of Assets)", "totalLabel": "Net Expenses" } } }, "auth_ref": [ "r17" ] }, "fnd_NmRule35d1EightyPctInvstmntPlcyTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/fnd/2025", "localname": "NmRule35d1EightyPctInvstmntPlcyTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Rule 35d-1 Eighty Percent Investment Policy [Text Block]" } } }, "auth_ref": [ "r59", "r61" ] }, "fnd_NmRule35d1TermDfnSmryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/fnd/2025", "localname": "NmRule35d1TermDfnSmryTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]" } } }, "auth_ref": [ "r60", "r61" ] }, "fnd_NmRule35d1TermSlctnCritSmryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/fnd/2025", "localname": "NmRule35d1TermSlctnCritSmryTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]" } } }, "auth_ref": [ "r60", "r61" ] }, "oef_ObjectiveHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectiveHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective [Heading]" } } }, "auth_ref": [ "r6" ] }, "oef_ObjectivePrimaryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectivePrimaryTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective, Primary [Text Block]" } } }, "auth_ref": [ "r6" ] }, "oef_ObjectiveSecondaryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectiveSecondaryTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective, Secondary [Text Block]" } } }, "auth_ref": [ "r6" ] }, "oef_OperatingExpensesCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OperatingExpensesCaption", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Operating Expenses Caption [Optional Text]" } } }, "auth_ref": [ "r17" ] }, "oef_OperatingExpensesColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OperatingExpensesColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Operating Expenses Column [Optional Text]" } } }, "auth_ref": [ "r17" ] }, "oef_OtherExpensesNewFundBasedOnEstimates": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherExpensesNewFundBasedOnEstimates", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Other Expenses, New Fund, Based on Estimates [Text]" } } }, "auth_ref": [ "r33" ] }, "oef_OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Other Expenses (as a percentage of Assets):", "totalLabel": "Other Expenses" } } }, "auth_ref": [ "r20" ] }, "oef_PerfInceptionDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerfInceptionDate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Performance Inception Date" } } }, "auth_ref": [ "r7" ] }, "oef_PerformanceAdditionalMarketIndex": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAdditionalMarketIndex", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Additional Market Index [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceAvailabilityPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAvailabilityPhone", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Availability Phone [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceAvailabilityWebSiteAddress": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAvailabilityWebSiteAddress", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Availability Website Address [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceInformationIllustratesVariabilityOfReturns": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceInformationIllustratesVariabilityOfReturns", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Information Illustrates Variability of Returns [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceMeasureAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceMeasureAxis", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "terseLabel": "Performance Measure [Axis]", "label": "Performance Measure [Axis]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceMeasureDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceMeasureDomain", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "terseLabel": "Before Taxes", "label": "Before Taxes" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceNarrativeTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Narrative [Text Block]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceOneYearOrLess": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceOneYearOrLess", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance One Year or Less [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformancePastDoesNotIndicateFuture": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformancePastDoesNotIndicateFuture", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Past Does Not Indicate Future [Text]" } } }, "auth_ref": [ "r8", "r43" ] }, "oef_PerformanceTableClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableClosingTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Closing [Text Block]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableDoesReflectSalesLoads": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableDoesReflectSalesLoads", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Does Reflect Sales Loads" } } }, "auth_ref": [ "r53" ] }, "oef_PerformanceTableExplanationAfterTaxHigher": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableExplanationAfterTaxHigher", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Explanation after Tax Higher" } } }, "auth_ref": [ "r58" ] }, "oef_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]" } } }, "auth_ref": [ "r50" ] }, "oef_PerformanceTableFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableFootnotesTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Footnotes" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Heading" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableMarketIndexChanged": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableMarketIndexChanged", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Market Index Changed" } } }, "auth_ref": [ "r55" ] }, "oef_PerformanceTableNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableNarrativeTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Narrative" } } }, "auth_ref": [ "r53" ] }, "oef_PerformanceTableNotRelevantToTaxDeferred": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableNotRelevantToTaxDeferred", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Not Relevant to Tax Deferred" } } }, "auth_ref": [ "r57" ] }, "oef_PerformanceTableOneClassOfAfterTaxShown": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableOneClassOfAfterTaxShown", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table One Class of after Tax Shown [Text]" } } }, "auth_ref": [ "r48", "r54" ] }, "oef_PerformanceTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance [Table]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableUsesHighestFederalRate": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableUsesHighestFederalRate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Uses Highest Federal Rate" } } }, "auth_ref": [ "r56" ] }, "oef_PortfolioTurnoverHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover [Heading]" } } }, "auth_ref": [ "r32" ] }, "oef_PortfolioTurnoverRate": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverRate", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover, Rate" } } }, "auth_ref": [ "r10", "r32" ] }, "oef_PortfolioTurnoverTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover [Text Block]" } } }, "auth_ref": [ "r32" ] }, "cik0001084380_Principalinvestmentrisks2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Principalinvestmentrisks2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Principalinvestmentrisks2Member [Member]", "terseLabel": "Principal investment risks", "documentation": "Principal investment risks" } } }, "auth_ref": [] }, "oef_ProspectusDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusDate", "presentation": [ "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Prospectus Date" } } }, "auth_ref": [ "r5" ] }, "oef_ProspectusLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusLineItems", "presentation": [ "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Prospectus [Line Items]" } } }, "auth_ref": [ "r3" ] }, "oef_ProspectusTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusTable", "presentation": [ "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "terseLabel": "Prospectus [Table]", "label": "Prospectus [Table]" } } }, "auth_ref": [ "r3" ] }, "oef_RedemptionFee": { "xbrltype": "nonPositiveMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RedemptionFee", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Redemption Fee", "negatedLabel": "Redemption Fee" } } }, "auth_ref": [ "r13" ] }, "oef_RedemptionFeeOverRedemption": { "xbrltype": "nonPositivePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RedemptionFeeOverRedemption", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Redemption Fee (as a percentage of Amount Redeemed)", "negatedLabel": "Redemption Fee (as a percentage of Amount Redeemed)" } } }, "auth_ref": [ "r13" ] }, "oef_RiskAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskAxis", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk [Axis]", "label": "Risk [Axis]" } } }, "auth_ref": [ "r37" ] }, "oef_RiskLoseMoneyMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskLoseMoneyMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Lose Money [Member]", "label": "Risk Lose Money [Member]" } } }, "auth_ref": [ "r36" ] }, "oef_RiskMoneyMarketFundMayImposeFeesOrSuspendSalesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundMayImposeFeesOrSuspendSalesMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Money Market Fund May Impose Fees or Suspend Sales [Member]", "label": "Risk Money Market Fund May Impose Fees or Suspend Sales [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskMoneyMarketFundMayNotPreserveDollarMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundMayNotPreserveDollarMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Money Market Fund May Not Preserve Dollar [Member]", "label": "Risk Money Market Fund May Not Preserve Dollar [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskMoneyMarketFundPriceFluctuatesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundPriceFluctuatesMember", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Money Market Fund Price Fluctuates [Member]", "label": "Risk Money Market Fund Price Fluctuates [Member]" } } }, "auth_ref": [ "r39" ] }, "oef_RiskMoneyMarketFundSponsorMayNotProvideSupportMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundSponsorMayNotProvideSupportMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Money Market Fund Sponsor May Not Provide Support [Member]", "label": "Risk Money Market Fund Sponsor May Not Provide Support [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskNondiversifiedStatusMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNondiversifiedStatusMember", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Nondiversified Status [Member]", "label": "Risk Nondiversified Status [Member]" } } }, "auth_ref": [ "r41" ] }, "oef_RiskNotInsuredDepositoryInstitutionMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNotInsuredDepositoryInstitutionMember", "presentation": [ "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Not Insured Depository Institution [Member]", "label": "Risk Not Insured Depository Institution [Member]" } } }, "auth_ref": [ "r40" ] }, "oef_RiskNotInsuredMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNotInsuredMember", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "terseLabel": "Risk Not Insured [Member]", "label": "Risk Not Insured [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskReturnAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskReturnAbstract", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "terseLabel": "Risk/Return:", "label": "Risk/Return:" } } }, "auth_ref": [ "r2" ] }, "oef_RiskReturnHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskReturnHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Risk/Return [Heading]" } } }, "auth_ref": [ "r63" ] }, "oef_RiskTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk [Text Block]" } } }, "auth_ref": [ "r37" ] }, "oef_RisksAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RisksAbstract", "lang": { "en-us": { "role": { "label": "Risks [Abstract]" } } }, "auth_ref": [ "r36" ] }, "cik0001084380_Russell3000Index3101Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3101Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3101Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3105Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3105Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData58", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3105Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3109Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3109Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData60", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3109Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3113Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3113Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData62", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3113Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3117Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3117Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData64", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3117Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3121Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3121Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData66", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3121Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index3125Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index3125Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index3125Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index313Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index313Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index313Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index317Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index317Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index317Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index31Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index31Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index31Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index321Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index321Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index321Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index325Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index325Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index325Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index329Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index329Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index329Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index333Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index333Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index333Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index337Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index337Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index337Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index341Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index341Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index341Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index345Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index345Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index345Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index349Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index349Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index349Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index353Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index353Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index353Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index357Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index357Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index357Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index35Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index35Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index35Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index361Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index361Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index361Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index365Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index365Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index365Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index369Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index369Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index369Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index373Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index373Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index373Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index377Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index377Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index377Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index381Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index381Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index381Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index385Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index385Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index385Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index389Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index389Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index389Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index393Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index393Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index393Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index397Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index397Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index397Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_Russell3000Index39Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "Russell3000Index39Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_Russell3000Index39Member [Member]", "terseLabel": "Russell 3000\u00ae Index", "documentation": "Russell 3000\u00ae Index" } } }, "auth_ref": [] }, "cik0001084380_S000005375Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005375Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRRiskTable5", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005375 [Member]", "terseLabel": "Nuveen Lifecycle 2010 Fund", "documentation": "Nuveen Lifecycle 2010 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005375Summary2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005375Summary2Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRRiskTable5" ], "lang": { "en-us": { "role": { "label": "S 000005375 Summary2 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005376Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005376Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRRiskTable7", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005376 [Member]", "terseLabel": "Nuveen Lifecycle 2015 Fund", "documentation": "Nuveen Lifecycle 2015 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005376Summary3Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005376Summary3Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRRiskTable7" ], "lang": { "en-us": { "role": { "label": "S 000005376 Summary3 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005377Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005377Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005377 [Member]", "terseLabel": "Nuveen Lifecycle 2020 Fund", "documentation": "Nuveen Lifecycle 2020 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005377Summary4Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005377Summary4Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "S 000005377 Summary4 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005378Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005378Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRRiskTable11", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005378 [Member]", "terseLabel": "Nuveen Lifecycle 2025 Fund", "documentation": "Nuveen Lifecycle 2025 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005378Summary5Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005378Summary5Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRRiskTable11" ], "lang": { "en-us": { "role": { "label": "S 000005378 Summary5 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005379Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005379Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRRiskTable13", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005379 [Member]", "terseLabel": "Nuveen Lifecycle 2030 Fund", "documentation": "Nuveen Lifecycle 2030 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005379Summary6Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005379Summary6Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRRiskTable13" ], "lang": { "en-us": { "role": { "label": "S 000005379 Summary6 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005380Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005380Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRRiskTable15", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005380 [Member]", "terseLabel": "Nuveen Lifecycle 2035 Fund", "documentation": "Nuveen Lifecycle 2035 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005380Summary7Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005380Summary7Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRRiskTable15" ], "lang": { "en-us": { "role": { "label": "S 000005380 Summary7 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000005382Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005382Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRRiskTable17", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000005382 [Member]", "terseLabel": "Nuveen Lifecycle 2040 Fund", "documentation": "Nuveen Lifecycle 2040 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000005382Summary8Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000005382Summary8Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRRiskTable17" ], "lang": { "en-us": { "role": { "label": "S 000005382 Summary8 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000012194Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000012194Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRRiskTable69", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000012194 [Member]", "terseLabel": "Nuveen Managed Allocation Fund", "documentation": "Nuveen Managed Allocation Fund" } } }, "auth_ref": [] }, "cik0001084380_S000012194Summary34Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000012194Summary34Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRRiskTable69" ], "lang": { "en-us": { "role": { "label": "S 000012194 Summary34 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000019659Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019659Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRRiskTable19", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000019659 [Member]", "terseLabel": "Nuveen Lifecycle 2045 Fund", "documentation": "Nuveen Lifecycle 2045 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000019659Summary9Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019659Summary9Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRRiskTable19" ], "lang": { "en-us": { "role": { "label": "S 000019659 Summary9 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000019660Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019660Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRRiskTable21", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000019660 [Member]", "terseLabel": "Nuveen Lifecycle 2050 Fund", "documentation": "Nuveen Lifecycle 2050 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000019660Summary10Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019660Summary10Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRRiskTable21" ], "lang": { "en-us": { "role": { "label": "S 000019660 Summary10 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000019661Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019661Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRRiskTable3", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000019661 [Member]", "terseLabel": "Nuveen Lifecycle Retirement Income Fund", "documentation": "Nuveen Lifecycle Retirement Income Fund" } } }, "auth_ref": [] }, "cik0001084380_S000019661Summary1Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000019661Summary1Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRRiskTable3" ], "lang": { "en-us": { "role": { "label": "S 000019661 Summary1 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026498Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026498Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRRiskTable33", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026498 [Member]", "terseLabel": "Nuveen Lifecycle Index 2010 Fund", "documentation": "Nuveen Lifecycle Index 2010 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026498Summary16Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026498Summary16Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRRiskTable33" ], "lang": { "en-us": { "role": { "label": "S 000026498 Summary16 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026499Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026499Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRRiskTable31", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026499 [Member]", "terseLabel": "Nuveen Lifecycle Index Retirement Income Fund", "documentation": "Nuveen Lifecycle Index Retirement Income Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026499Summary15Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026499Summary15Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRRiskTable31" ], "lang": { "en-us": { "role": { "label": "S 000026499 Summary15 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026501Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026501Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRRiskTable35", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026501 [Member]", "terseLabel": "Nuveen Lifecycle Index 2015 Fund", "documentation": "Nuveen Lifecycle Index 2015 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026501Summary17Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026501Summary17Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRRiskTable35" ], "lang": { "en-us": { "role": { "label": "S 000026501 Summary17 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026502Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026502Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRRiskTable37", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026502 [Member]", "terseLabel": "Nuveen Lifecycle Index 2020 Fund", "documentation": "Nuveen Lifecycle Index 2020 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026502Summary18Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026502Summary18Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRRiskTable37" ], "lang": { "en-us": { "role": { "label": "S 000026502 Summary18 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026503Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026503Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRRiskTable39", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026503 [Member]", "terseLabel": "Nuveen Lifecycle Index 2025 Fund", "documentation": "Nuveen Lifecycle Index 2025 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026503Summary19Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026503Summary19Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRRiskTable39" ], "lang": { "en-us": { "role": { "label": "S 000026503 Summary19 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026504Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026504Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRRiskTable41", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026504 [Member]", "terseLabel": "Nuveen Lifecycle Index 2030 Fund", "documentation": "Nuveen Lifecycle Index 2030 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026504Summary20Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026504Summary20Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRRiskTable41" ], "lang": { "en-us": { "role": { "label": "S 000026504 Summary20 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026505Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026505Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRRiskTable43", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026505 [Member]", "terseLabel": "Nuveen Lifecycle Index 2035 Fund", "documentation": "Nuveen Lifecycle Index 2035 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026505Summary21Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026505Summary21Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRRiskTable43" ], "lang": { "en-us": { "role": { "label": "S 000026505 Summary21 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026506Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026506Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRRiskTable45", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026506 [Member]", "terseLabel": "Nuveen Lifecycle Index 2040 Fund", "documentation": "Nuveen Lifecycle Index 2040 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026506Summary22Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026506Summary22Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRRiskTable45" ], "lang": { "en-us": { "role": { "label": "S 000026506 Summary22 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026507Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026507Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRRiskTable47", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026507 [Member]", "terseLabel": "Nuveen Lifecycle Index 2045 Fund", "documentation": "Nuveen Lifecycle Index 2045 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026507Summary23Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026507Summary23Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRRiskTable47" ], "lang": { "en-us": { "role": { "label": "S 000026507 Summary23 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000026508Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026508Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRRiskTable49", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000026508 [Member]", "terseLabel": "Nuveen Lifecycle Index 2050 Fund", "documentation": "Nuveen Lifecycle Index 2050 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000026508Summary24Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000026508Summary24Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRRiskTable49" ], "lang": { "en-us": { "role": { "label": "S 000026508 Summary24 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000031926Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000031926Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRRiskTable51", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000031926 [Member]", "terseLabel": "Nuveen Lifecycle Index 2055 Fund", "documentation": "Nuveen Lifecycle Index 2055 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000031926Summary25Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000031926Summary25Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRRiskTable51" ], "lang": { "en-us": { "role": { "label": "S 000031926 Summary25 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000031927Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000031927Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRRiskTable23", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000031927 [Member]", "terseLabel": "Nuveen Lifecycle 2055 Fund", "documentation": "Nuveen Lifecycle 2055 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000031927Summary11Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000031927Summary11Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRRiskTable23" ], "lang": { "en-us": { "role": { "label": "S 000031927 Summary11 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000034958Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034958Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRRiskTable67", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000034958 [Member]", "terseLabel": "Nuveen Lifestyle Aggressive Growth Fund", "documentation": "Nuveen Lifestyle Aggressive Growth Fund" } } }, "auth_ref": [] }, "cik0001084380_S000034958Summary33Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034958Summary33Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRRiskTable67" ], "lang": { "en-us": { "role": { "label": "S 000034958 Summary33 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000034959Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034959Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRRiskTable61", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000034959 [Member]", "terseLabel": "Nuveen Lifestyle Conservative Fund", "documentation": "Nuveen Lifestyle Conservative Fund" } } }, "auth_ref": [] }, "cik0001084380_S000034959Summary30Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034959Summary30Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRRiskTable61" ], "lang": { "en-us": { "role": { "label": "S 000034959 Summary30 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000034960Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034960Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRRiskTable65", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000034960 [Member]", "terseLabel": "Nuveen Lifestyle Growth Fund", "documentation": "Nuveen Lifestyle Growth Fund" } } }, "auth_ref": [] }, "cik0001084380_S000034960Summary32Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034960Summary32Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRRiskTable65" ], "lang": { "en-us": { "role": { "label": "S 000034960 Summary32 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000034961Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034961Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRRiskTable59", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000034961 [Member]", "terseLabel": "Nuveen Lifestyle Income Fund", "documentation": "Nuveen Lifestyle Income Fund" } } }, "auth_ref": [] }, "cik0001084380_S000034961Summary29Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034961Summary29Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRRiskTable59" ], "lang": { "en-us": { "role": { "label": "S 000034961 Summary29 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000034962Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034962Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRRiskTable63", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000034962 [Member]", "terseLabel": "Nuveen Lifestyle Moderate Fund", "documentation": "Nuveen Lifestyle Moderate Fund" } } }, "auth_ref": [] }, "cik0001084380_S000034962Summary31Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000034962Summary31Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRRiskTable63" ], "lang": { "en-us": { "role": { "label": "S 000034962 Summary31 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000046661Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000046661Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRRiskTable25", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000046661 [Member]", "terseLabel": "Nuveen Lifecycle 2060 Fund", "documentation": "Nuveen Lifecycle 2060 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000046661Summary12Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000046661Summary12Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRRiskTable25" ], "lang": { "en-us": { "role": { "label": "S 000046661 Summary12 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000046662Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000046662Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRRiskTable53", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000046662 [Member]", "terseLabel": "Nuveen Lifecycle Index 2060 Fund", "documentation": "Nuveen Lifecycle Index 2060 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000046662Summary26Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000046662Summary26Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRRiskTable53" ], "lang": { "en-us": { "role": { "label": "S 000046662 Summary26 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000069450Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000069450Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRRiskTable27", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000069450 [Member]", "terseLabel": "Nuveen Lifecycle 2065 Fund", "documentation": "Nuveen Lifecycle 2065 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000069450Summary13Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000069450Summary13Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRRiskTable27" ], "lang": { "en-us": { "role": { "label": "S 000069450 Summary13 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000069451Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000069451Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRRiskTable55", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000069451 [Member]", "terseLabel": "Nuveen Lifecycle Index 2065 Fund", "documentation": "Nuveen Lifecycle Index 2065 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000069451Summary27Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000069451Summary27Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRRiskTable55" ], "lang": { "en-us": { "role": { "label": "S 000069451 Summary27 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000095269Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000095269Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRRiskTable29", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000095269 [Member]", "terseLabel": "Nuveen Lifecycle 2070 Fund", "documentation": "Nuveen Lifecycle 2070 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000095269Summary14Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000095269Summary14Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRRiskTable29" ], "lang": { "en-us": { "role": { "label": "S 000095269 Summary14 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_S000095270Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000095270Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRRiskTable57", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "S 000095270 [Member]", "terseLabel": "Nuveen Lifecycle Index 2070 Fund", "documentation": "Nuveen Lifecycle Index 2070 Fund" } } }, "auth_ref": [] }, "cik0001084380_S000095270Summary28Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "S000095270Summary28Member", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRCustomRiskRole70", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRRiskTable57" ], "lang": { "en-us": { "role": { "label": "S 000095270 Summary28 [Member]", "terseLabel": "Prospectus Summary", "documentation": "Prospectus Summary" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2010Index359Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2010Index359Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData32", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2010Index359Member [Member]", "terseLabel": "S&P Target Date 2010 Index", "documentation": "S&P Target Date 2010 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2010Index37Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2010Index37Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData4", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2010Index37Member [Member]", "terseLabel": "S&P Target Date 2010 Index", "documentation": "S&P Target Date 2010 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2015Index311Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2015Index311Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData6", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2015Index311Member [Member]", "terseLabel": "S&P Target Date 2015 Index", "documentation": "S&P Target Date 2015 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2015Index363Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2015Index363Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData34", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2015Index363Member [Member]", "terseLabel": "S&P Target Date 2015 Index", "documentation": "S&P Target Date 2015 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2020Index315Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2020Index315Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2020Index315Member [Member]", "terseLabel": "S&P Target Date 2020 Index", "documentation": "S&P Target Date 2020 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2020Index367Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2020Index367Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData36", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2020Index367Member [Member]", "terseLabel": "S&P Target Date 2020 Index", "documentation": "S&P Target Date 2020 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2025Index319Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2025Index319Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2025Index319Member [Member]", "terseLabel": "S&P Target Date 2025 Index", "documentation": "S&P Target Date 2025 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2025Index371Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2025Index371Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData38", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2025Index371Member [Member]", "terseLabel": "S&P Target Date 2025 Index", "documentation": "S&P Target Date 2025 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2030Index323Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2030Index323Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData12", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2030Index323Member [Member]", "terseLabel": "S&P Target Date 2030 Index", "documentation": "S&P Target Date 2030 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2030Index375Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2030Index375Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData40", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2030Index375Member [Member]", "terseLabel": "S&P Target Date 2030 Index", "documentation": "S&P Target Date 2030 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2035Index327Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2035Index327Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData14", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2035Index327Member [Member]", "terseLabel": "S&P Target Date 2035 Index", "documentation": "S&P Target Date 2035 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2035Index379Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2035Index379Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData42", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2035Index379Member [Member]", "terseLabel": "S&P Target Date 2035 Index", "documentation": "S&P Target Date 2035 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2040Index331Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2040Index331Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData16", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2040Index331Member [Member]", "terseLabel": "S&P Target Date 2040 Index", "documentation": "S&P Target Date 2040 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2040Index383Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2040Index383Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData44", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2040Index383Member [Member]", "terseLabel": "S&P Target Date 2040 Index", "documentation": "S&P Target Date 2040 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2045Index335Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2045Index335Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData18", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2045Index335Member [Member]", "terseLabel": "S&P Target Date 2045 Index", "documentation": "S&P Target Date 2045 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2045Index387Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2045Index387Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData46", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2045Index387Member [Member]", "terseLabel": "S&P Target Date 2045 Index", "documentation": "S&P Target Date 2045 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2050Index339Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2050Index339Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData20", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2050Index339Member [Member]", "terseLabel": "S&P Target Date 2050 Index", "documentation": "S&P Target Date 2050 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2050Index391Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2050Index391Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData48", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2050Index391Member [Member]", "terseLabel": "S&P Target Date 2050 Index", "documentation": "S&P Target Date 2050 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2055Index343Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2055Index343Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData22", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2055Index343Member [Member]", "terseLabel": "S&P Target Date 2055 Index", "documentation": "S&P Target Date 2055 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2055Index395Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2055Index395Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData50", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2055Index395Member [Member]", "terseLabel": "S&P Target Date 2055 Index", "documentation": "S&P Target Date 2055 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2060Index347Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2060Index347Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData24", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2060Index347Member [Member]", "terseLabel": "S&P Target Date 2060 Index", "documentation": "S&P Target Date 2060 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2060Index399Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2060Index399Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData52", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2060Index399Member [Member]", "terseLabel": "S&P Target Date 2060 Index", "documentation": "S&P Target Date 2060 Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2065Index3103Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2065Index3103Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData54", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2065Index3103Member [Member]", "terseLabel": "S&P Target Date 2065+ Index", "documentation": "S&P Target Date 2065+ Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDate2065Index351Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDate2065Index351Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData26", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDate2065Index351Member [Member]", "terseLabel": "S&P Target Date 2065+ Index", "documentation": "S&P Target Date 2065+ Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDateRetirementIncomeIndex33Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDateRetirementIncomeIndex33Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData2", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDateRetirementIncomeIndex33Member [Member]", "terseLabel": "S&P Target Date Retirement Income Index", "documentation": "S&P Target Date Retirement Income Index" } } }, "auth_ref": [] }, "cik0001084380_SPTargetDateRetirementIncomeIndex355Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "SPTargetDateRetirementIncomeIndex355Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData30", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "cik0001084380_SPTargetDateRetirementIncomeIndex355Member [Member]", "terseLabel": "S&P Target Date Retirement Income Index", "documentation": "S&P Target Date Retirement Income Index" } } }, "auth_ref": [] }, "oef_ShareClassDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareClassDomain", "presentation": [ "http://TIAA.com/20250531/role/DocumentAndEntityInformation1", "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Share Classes" } } }, "auth_ref": [ "r4" ] }, "oef_ShareholderFeeOther": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeeOther", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Shareholder Fee, Other" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesAbstract", "lang": { "en-us": { "role": { "label": "Shareholder Fees:" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesCaption", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees Caption [Optional Text]" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees Column [Optional Text]" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesTableTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees [Table]" } } }, "auth_ref": [ "r13" ] }, "oef_StrategyHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyHeading", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy [Heading]" } } }, "auth_ref": [ "r35" ] }, "oef_StrategyNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyNarrativeTextBlock", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy Narrative [Text Block]" } } }, "auth_ref": [ "r35" ] }, "oef_StrategyPortfolioConcentration": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyPortfolioConcentration", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy Portfolio Concentration [Text]" } } }, "auth_ref": [ "r35" ] }, "oef_SupplementToProspectusTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "SupplementToProspectusTextBlock", "presentation": [ "http://xbrl.sec.gov/rr/role/N1aSupplement" ], "lang": { "en-us": { "role": { "label": "Supplement to Prospectus [Text Block]" } } }, "auth_ref": [ "r2" ] }, "oef_ThirtyDayTaxEquivalentYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayTaxEquivalentYield", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Tax Equivalent Yield" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYield", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldCaption", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Caption [Optional Text]" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldColumnName", "presentation": [ "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Column [Optional Text]" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldPhone", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Phone" } } }, "auth_ref": [ "r52" ] }, "cik0001084380_UnderlyingETFRisk2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "UnderlyingETFRisk2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_UnderlyingETFRisk2Member [Member]", "terseLabel": "Underlying ETF Risk", "documentation": "Underlying ETF Risk" } } }, "auth_ref": [] }, "cik0001084380_UnderlyingFundsRisks2Member": { "xbrltype": "domainItemType", "nsuri": "http://TIAA.com/20250531", "localname": "UnderlyingFundsRisks2Member", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://TIAA.com/20250531/role/RRRiskTable11", "http://TIAA.com/20250531/role/RRRiskTable13", "http://TIAA.com/20250531/role/RRRiskTable15", "http://TIAA.com/20250531/role/RRRiskTable17", "http://TIAA.com/20250531/role/RRRiskTable19", "http://TIAA.com/20250531/role/RRRiskTable21", "http://TIAA.com/20250531/role/RRRiskTable23", "http://TIAA.com/20250531/role/RRRiskTable25", "http://TIAA.com/20250531/role/RRRiskTable27", "http://TIAA.com/20250531/role/RRRiskTable29", "http://TIAA.com/20250531/role/RRRiskTable3", "http://TIAA.com/20250531/role/RRRiskTable31", "http://TIAA.com/20250531/role/RRRiskTable33", "http://TIAA.com/20250531/role/RRRiskTable35", "http://TIAA.com/20250531/role/RRRiskTable37", "http://TIAA.com/20250531/role/RRRiskTable39", "http://TIAA.com/20250531/role/RRRiskTable41", "http://TIAA.com/20250531/role/RRRiskTable43", "http://TIAA.com/20250531/role/RRRiskTable45", "http://TIAA.com/20250531/role/RRRiskTable47", "http://TIAA.com/20250531/role/RRRiskTable49", "http://TIAA.com/20250531/role/RRRiskTable5", "http://TIAA.com/20250531/role/RRRiskTable51", "http://TIAA.com/20250531/role/RRRiskTable53", "http://TIAA.com/20250531/role/RRRiskTable55", "http://TIAA.com/20250531/role/RRRiskTable57", "http://TIAA.com/20250531/role/RRRiskTable59", "http://TIAA.com/20250531/role/RRRiskTable61", "http://TIAA.com/20250531/role/RRRiskTable63", "http://TIAA.com/20250531/role/RRRiskTable65", "http://TIAA.com/20250531/role/RRRiskTable67", "http://TIAA.com/20250531/role/RRRiskTable69", "http://TIAA.com/20250531/role/RRRiskTable7", "http://TIAA.com/20250531/role/RRRiskTable9" ], "lang": { "en-us": { "role": { "label": "cik0001084380_UnderlyingFundsRisks2Member [Member]", "terseLabel": "Underlying Funds Risks", "documentation": "Underlying Funds Risks" } } }, "auth_ref": [] }, "oef_YearToDateReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "YearToDateReturnLabel", "presentation": [ "http://TIAA.com/20250531/role/RRDetailData10", "http://TIAA.com/20250531/role/RRDetailData12", "http://TIAA.com/20250531/role/RRDetailData14", "http://TIAA.com/20250531/role/RRDetailData16", "http://TIAA.com/20250531/role/RRDetailData18", "http://TIAA.com/20250531/role/RRDetailData2", "http://TIAA.com/20250531/role/RRDetailData20", "http://TIAA.com/20250531/role/RRDetailData22", "http://TIAA.com/20250531/role/RRDetailData24", "http://TIAA.com/20250531/role/RRDetailData26", "http://TIAA.com/20250531/role/RRDetailData28", "http://TIAA.com/20250531/role/RRDetailData30", "http://TIAA.com/20250531/role/RRDetailData32", "http://TIAA.com/20250531/role/RRDetailData34", "http://TIAA.com/20250531/role/RRDetailData36", "http://TIAA.com/20250531/role/RRDetailData38", "http://TIAA.com/20250531/role/RRDetailData4", "http://TIAA.com/20250531/role/RRDetailData40", "http://TIAA.com/20250531/role/RRDetailData42", "http://TIAA.com/20250531/role/RRDetailData44", "http://TIAA.com/20250531/role/RRDetailData46", "http://TIAA.com/20250531/role/RRDetailData48", "http://TIAA.com/20250531/role/RRDetailData50", "http://TIAA.com/20250531/role/RRDetailData52", "http://TIAA.com/20250531/role/RRDetailData54", "http://TIAA.com/20250531/role/RRDetailData56", "http://TIAA.com/20250531/role/RRDetailData58", "http://TIAA.com/20250531/role/RRDetailData6", "http://TIAA.com/20250531/role/RRDetailData60", "http://TIAA.com/20250531/role/RRDetailData62", "http://TIAA.com/20250531/role/RRDetailData64", "http://TIAA.com/20250531/role/RRDetailData66", "http://TIAA.com/20250531/role/RRDetailData68", "http://TIAA.com/20250531/role/RRDetailData8", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Year to Date Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] } } } }, "std_ref": { "r0": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Exchange Act", "Number": "240", "Section": "12", "Subsection": "b-2" }, "r1": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A" }, "r2": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1" }, "r3": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a" }, "r4": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a", "Paragraph": "1" }, "r5": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a", "Paragraph": "3" }, "r6": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "2", "Subsection": "a" }, "r7": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "i" }, "r8": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "iiii", "Clause": "A" }, "r9": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "7" }, "r10": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "e" }, "r11": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "1" }, "r12": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "1", "Subparagraph": "b" }, "r13": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2" }, "r14": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "a", "Sentence": "i" }, "r15": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "c" }, "r16": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "d" }, "r17": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3" }, "r18": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "a" }, "r19": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "b" }, "r20": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "i" }, "r21": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "ii" }, "r22": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "iii" }, "r23": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d" }, "r24": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d", "Clause": "B", "Sentence": "ii" }, "r25": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d", "Sentence": "iii" }, "r26": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "e" }, "r27": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "i" }, "r28": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "vi" }, "r29": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "vii" }, "r30": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "4" }, "r31": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "4", "Subparagraph": "f" }, "r32": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "5" }, "r33": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "6", "Subparagraph": "a" }, "r34": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instrution", "Paragraph": "3" }, "r35": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "a" }, "r36": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1" }, "r37": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "i", "Clause": "instruction" }, "r38": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "ii" }, "r39": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "ii", "Clause": "A" }, "r40": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "iii" }, "r41": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "iv" }, "r42": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2" }, "r43": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "i" }, "r44": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii" }, "r45": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "1", "Subclause": "a" }, "r46": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "3", "Subclause": "b" }, "r47": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "3", "Subclause": "c" }, "r48": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iii" }, "r49": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "3" }, "r50": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "3", "Subclause": "c" }, "r51": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "a", "Sentence": "2" }, "r52": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "d", "Sentence": "2" }, "r53": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv" }, "r54": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Clause": "C" }, "r55": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Clause": "c", "Sentence": "2" }, "r56": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "A" }, "r57": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "B" }, "r58": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "D" }, "r59": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "Item", "Subsection": "4", "Paragraph": "a", "Subparagraph": "1" }, "r60": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "Item", "Subsection": "4", "Paragraph": "a", "Subparagraph": "1", "Sentence": "instruction" }, "r61": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Investment Company Act", "Number": "270", "Section": "35d-1" }, "r62": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Regulation S-T", "Number": "232", "Section": "313" }, "r63": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Section": "2", "Name": "Form N-1A", "Subsection": "a" } } }