<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>2119</ContextCount>
  <ElementCount>75</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>319</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>010000 - Disclosure - Form N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/N1aCover</Role>
      <ShortName>Form N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010000 - Document - Document and Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/DocumentAndEntityInformation1</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010002 - Disclosure - Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturn</Role>
      <ShortName>Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>010003 - Disclosure - Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/FeesAndExpenses</Role>
      <ShortName>Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>010004 - Disclosure - Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentStrategy</Role>
      <ShortName>Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>010004 - Schedule - Investment Risks {Unlabeled}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRCustomRiskRole70</Role>
      <ShortName>Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>010006 - Disclosure - Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceManagement</Role>
      <ShortName>Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>020050 - Disclosure - Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/BarChartData</Role>
      <ShortName>Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>020102 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Retirement Income Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData2</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Retirement Income Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>020104 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2010 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData4</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2010 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>020106 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2015 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData6</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2015 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>020108 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2020 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData8</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2020 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>020110 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2025 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData10</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2025 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>020112 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2030 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData12</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2030 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>020114 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2035 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData14</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2035 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>020116 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2040 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData16</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2040 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>020118 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2045 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData18</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2045 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>020120 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2050 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData20</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2050 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>020122 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2055 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData22</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2055 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>020124 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2060 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData24</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2060 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>020126 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2065 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData26</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2065 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>020128 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle 2070 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData28</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle 2070 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>020130 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index Retirement Income Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData30</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index Retirement Income Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>020132 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2010 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData32</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2010 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>020134 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2015 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData34</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2015 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>020136 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2020 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData36</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2020 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>020138 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2025 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData38</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2025 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>020140 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2030 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData40</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2030 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>020142 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2035 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData42</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2035 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>020144 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2040 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData44</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2040 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>020146 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2045 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData46</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2045 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>020148 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2050 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData48</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2050 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>020150 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2055 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData50</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2055 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>020152 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2060 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData52</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2060 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>020154 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2065 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData54</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2065 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>020156 - Disclosure - Risk/Return Detail Data (Nuveen Lifecycle Index 2070 Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData56</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifecycle Index 2070 Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>020158 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Income Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData58</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifestyle Income Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>020160 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Conservative Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData60</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifestyle Conservative Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>020162 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Moderate Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData62</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifestyle Moderate Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>020164 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Growth Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData64</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifestyle Growth Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>020166 - Disclosure - Risk/Return Detail Data (Nuveen Lifestyle Aggressive Growth Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData66</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Lifestyle Aggressive Growth Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="c117115_497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>020168 - Disclosure - Risk/Return Detail Data (Nuveen Managed Allocation Fund) {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://TIAA.com/20250531/role/RRDetailData68</Role>
      <ShortName>Risk/Return Detail Data (Nuveen Managed Allocation Fund)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="497" isN1a="true" isN2Prospectus="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="c117115_497.htm">c117115_497.htm</File>
    <File>c497-20260720.xsd</File>
    <File>c497-20260720_def.xml</File>
    <File>c497-20260720_lab.xml</File>
    <File>c497-20260720_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img_026c83fd4a4f4f2.jpg</File>
    <File>img_0b90d9ebadef4f1.jpg</File>
    <File>img_0d48005d4b494f2.jpg</File>
    <File>img_0e4de77289864f1.jpg</File>
    <File>img_0f32434c9e114f1.jpg</File>
    <File>img_1a74089621784f1.jpg</File>
    <File>img_1bcc1d6f5fa14f2.jpg</File>
    <File>img_273bccaa40624f2.jpg</File>
    <File>img_28dff06297474f1.jpg</File>
    <File>img_2aed486da29e4f2.jpg</File>
    <File>img_343dfc8b2e4e4f1.jpg</File>
    <File>img_3bcd44cace594f1.jpg</File>
    <File>img_407821d473774f3.jpg</File>
    <File>img_425b6934db784f1.jpg</File>
    <File>img_487b8ef3511c4f1.jpg</File>
    <File>img_5e4a34853a294m2.jpg</File>
    <File>img_601eb1ae06074f2.jpg</File>
    <File>img_63915e47187d4f1.jpg</File>
    <File>img_671df0a69a214f2.jpg</File>
    <File>img_74f25ccc27c84f1.jpg</File>
    <File>img_76d7d27ecc9d4f1.jpg</File>
    <File>img_7a0458c6b8124f1.jpg</File>
    <File>img_7cbe98299e9e4f3.jpg</File>
    <File>img_8051c0b4e5bf4f2.jpg</File>
    <File>img_883686a8091f4f3.jpg</File>
    <File>img_8c8d9d50af324f4.jpg</File>
    <File>img_8de8f47874ee4f3.jpg</File>
    <File>img_94918ec368244f2.jpg</File>
    <File>img_9c3837da79174f2.jpg</File>
    <File>img_a1d44a0f721d4f3.jpg</File>
    <File>img_a9c3068bee1b4f1.jpg</File>
    <File>img_ab6a65fb779b4f2.jpg</File>
    <File>img_c3df1da08ecf4f2.jpg</File>
    <File>img_c6156de8727c4f2.jpg</File>
    <File>img_da0b120988794f1.jpg</File>
    <File>img_dd6ef26623744f1.jpg</File>
    <File>img_ddbeb2f6ef9c4f2.jpg</File>
    <File>img_e7eee5c78f7b4f2.jpg</File>
    <File>img_fdeacd371a9d4m2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5934">http://xbrl.sec.gov/oef/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
