Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Loans Receivable Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block] Hotel Hotel [Member] Liabilities: Lease, Liabilities [Abstract] Lease, Liabilities [Abstract] Payments of mortgage loans Principal Payments Of Mortgage Loans Payable Cash outflow relating to principal payments of mortgage loans payable. Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] 803 Corday 803 Corday [Member] 803 Corday Financial Highlights Condensed Financial Information Disclosure [Text Block] Selected condensed financial information per Accumulation Unit and Financial Highlights. Statistical Measurement [Domain] Statistical Measurement [Domain] (Decrease) in payable for securities purchased Increase (Decrease) Marketable Securities Excluding Real Estate, Payable Increase (Decrease) Marketable Securities Excluding Real Estate, Payable Proceeds from payoffs of loans receivable from related parties Proceeds From Collection Of Loans Receivable, Related Party, Operating Activities Proceeds From Collection Of Loans Receivable, Related Party, Operating Activities Number of Loans Loans Receivable, Number Of Loans Loans Receivable, Number Of Loans Subsequent Event Subsequent Event [Member] Maximum percentage of noncontrolling ownership interest in joint ventures Maximum Percentage Of Noncontrolling Ownership Interest In Joint Ventures Maximum percentage of noncontrolling ownership interest in joint ventures. Document Fiscal Year Focus Document Fiscal Year Focus BBB- Standard & Poor's, BBB- Rating [Member] Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Excess of revenues over expenses Realized Gain Loss On Real Estate Investments In Joint Ventures The amount of realized gain loss on real estate investments in joint ventures. Industrial, Apartments, Office, Retail, and Other Office, Apartment, Retail, Industrial, and Other [Member] Office, Apartment, Retail, Industrial, and Other 2027 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Prior Year Leases, Lessor, Prior Year [Abstract] Leases, Lessor, Prior Year [Abstract] Net realized and unrealized gain (loss) on investments and debt (in dollars per share) Net Realized And Unrealized Gain On Investments, Mortgage Loans Payable, And Loans Payable Net Realized And Unrealized Gain On Investments, Mortgage Loans Payable, And Loans Payable Schedule of Key Characteristics of Credit Agreement Schedule of Long-Term Debt Instruments [Table Text Block] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Schedule of Results of Operations of the Joint Venture Schedule Of Results Of Operations Of The Joint Venture [Table Text Block] Tabular disclosure of the Financial position and results of operations of the joint ventures. Industrial Industrial Property [Member] Loans payable, at fair value (principal outstanding: $760.8 and $892.4) Loans payable Total Loans Payable Mortgage Loans Payable And Loans Payable, Fair Value Mortgage Loans Payable And Loans Payable, Fair Value Purchases and originations of loans receivable Payments for (Proceeds from) Loans Receivable Liquidity units, units purchased (in shares) Accumulation Units, Units Purchased Accumulation Units, Units Purchased Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Apartment Apartment [Member] Equity Ownership Interest Investment Owned, Ownership Percentage Investment Owned, Ownership Percentage Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Senior Notes, Series A and Series B Senior Notes, Series A And Series B [Member] Senior Notes, Series A And Series B Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Operating expenses Operating expenses Represents the total of the costs related to real estate revenues, including management, leasing, and development services but excluding capitalized interest in inventory that was charged against earnings. Investments [Domain] Investments [Domain] Leases [Abstract] Leases [Abstract] Schedule of Changes in the Number of Accumulation Units Outstanding Schedule Of Changes In The Number Of Accumulation Units Outstanding [Table Text Block] Tabular disclosure changes in the number of accumulation units outstanding. Purchase of real estate properties Payments To Acquire Real Estate Held-For-Investment, Operating Activities Payments To Acquire Real Estate Held-For-Investment, Operating Activities Consolidated Entities [Domain] Consolidated Entities [Domain] Related Party Transactions Related Party Transactions Disclosure [Text Block] Key Terms: Lease, Key Terms [Abstract] Lease, Key Terms [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Expense charges Ratio To Average Net Assets, Expenses Ratio of average net assets to expenses. Entity Address, State or Province Entity Address, State or Province Credited for premiums (in shares) Credited For Premiums Represents the number of accumulation units premiums credited during the reporting period. Terminal EBITDA Multiple Measurement Input, Terminal EBITDA Multiple [Member] Measurement Input, Terminal EBITDA Multiple PEO Total Compensation Amount PEO Total Compensation Amount CASH, CASH EQUIVALENTS, CASH HELD BY WHOLLY OWNED PROPERTIES AND RESTRICTED CASH Cash and Cash Equivalents [Abstract] Other unsecured debt Unrealized Gain (Loss) On Other Unsecured Debt Unrealized Gain (Loss) On Other Unsecured Debt Schedule of Investment in Real Estate Operating Business Schedule Of Investment In Real Estate Operating Business [Table Text Block] Schedule Of Investment In Real Estate Operating Business Churchill on the Park Churchill On The Park [Member] Churchill On The Park Schedule of Key Terms of the Loans Schedule of Related Party Transactions [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Real estate operating business (cost: $623.5 and $621.8) Real estate operating business Fair Value Of Real Estate Operating Business Fair Value Of Real Estate Operating Business Shakopee Shakopee [Member] Shakopee Number of reportable segments Number of Reportable Segments Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Silverpeak NRE FundCo 2 LLC Silverpeak NRE FundCo 2 LLC [Member] Silverpeak NRE FundCo 2 LLC 2030 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Midwest United States, Midwest [Member] United States, Midwest IDR - Core Property Index Fund, LLC IDR - Core Property Index Fund, LLC [Member] IDR - Core Property Index Fund, LLC [Member] Schedule of Right-of-Use Assets and Lease Liabilities Related to Ground Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Liquidity guarantee charges Liquidity Guarantee Charges Charges related to TIAA's liquidity guarantee. Concentration Risk [Table] Concentration Risk [Table] Proceeds from sales of other real estate investments Proceeds From Sale Of Other Real Estate, Operating Activities Proceeds From Sale Of Other Real Estate, Operating Activities Entity Address, City or Town Entity Address, City or Town INVESTMENT INCOME, NET Investment income, net Investment Income Net Of Fund Expenses Income net of fund expenses derived from investments in Real Estate properties, Real Estate Joint Ventures and Limited Partnerships and Real Estate related marketable securities, and other debt and equity securities. Real estate funds (cost: $935.6 and $918.3) Fair Value Of Real Estate Funds Fair Value Of Real Estate Funds Receivables [Abstract] Receivables [Abstract] Project Sonic Project Sonic [Member] Project Sonic Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Terminal Growth Rate Measurement Input, Long-Term Revenue Growth Rate [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Real Estate Joint Ventures Real Estate Joint Ventures, Including Disposals [Member] Real Estate Joint Ventures, Including Disposals [Member] SUPPLEMENTAL NON-CASH DISCLOSURES Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Level 2: Significant Other Observable Inputs Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Loans receivable Unrealized Gain (Loss) On Loans Receivable Unrealized Gain (Loss) On Loans Receivable Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Assets: Lease, Assets [Abstract] Lease, Assets [Abstract] 2029 2028 Lessor, Operating Lease, Payment to be Received, Year Three Flagler REA Healthcare Properties Partnership Flagler REA Healthcare Properties Partnership [Member] Flagler REA Healthcare Properties Partnership Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] SP V - II, LLC SP V - II, LLC [Member] SP V - II, LLC [Member] Significant Accounting Policy Updates and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Land Land [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Other unsecured debt Unsecured Debt [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Accumulation Units Accumulated Units Disclosure [Text Block] Change in Accumulation Units outstanding for each period presented. Schedule of Reconciliation of Liabilities Measured at Fair Value on Recurring Basis, Unobservable Inputs Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Marketable securities: MarketableSecuritiesAbstract0 Weighted Average Cost of Capital Risk Premium Multiple Weighted Average Cost of Capital Risk Premium Multiple [Member] Weighted Average Cost of Capital Risk Premium Multiple [Member] East United States, East [Member] United States, East Schedule of Aggregate Minimum Annual Payments for Ground Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Current Period Leases, Lessee, Current Year [Abstract] Leases, Lessee, Current Year [Abstract] Document Period End Date Document Period End Date Securities for reverse repurchase agreements, asset coverage ratio Securities For Reverse Repurchase Agreements, Asset Coverage Ratio Securities For Reverse Repurchase Agreements, Asset Coverage Ratio Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Schedule of Condensed Financial Information for an Accumulation Unit of the Account Schedule Of Condensed Financial Information For An Accumulation Unit Of The Account [Table Text Block] Proceeds from sales of real estate properties Proceeds From Sale Of Real Estate Properties Cash received from the sale of investments in real estate during the current period. FROM OPERATIONS FROM OPERATIONS Real estate joint ventures (cost: $5,109.8 and $5,115.5) Fair Value Of Real Estate Joint Ventures Fair Value Of Real Estate Joint Ventures Realized Gain (Loss) on Sale Gain (Loss) on Sale of Properties Face amount of debt issued Maximum Capacity (in millions) Principal (in millions) Debt Instrument, Face Amount 2028 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two One Biscayne Tower Mezzanine One Biscayne Tower Mezzanine [Member] One Biscayne Tower Mezzanine Real estate properties Unrealized Gain (Loss) On Real Estate Properties The increase (decrease) in the value of unsold real estate properties whose gains (losses) were included in earnings. Lowe Enterprises Lowe Enterprises [Member] Lowe Enterprises Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Leases Lessor, Operating Leases [Text Block] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Series E Senior Notes, Series E [Member] Senior Notes, Series E Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Rogers Rogers [Member] Rogers Revolving Credit Facility Unsecured Revolving Credit Facility [Member] Unsecured Revolving Credit Facility [Member] Entity Shell Company Entity Shell Company Total realized and unrealized gains (losses) included in changes in net assets Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Extension option duration Debt Instrument, Extension Option Duration Debt Instrument, Extension Option Duration DataBank Databank [Member] Databank Segment Reporting Segment Reporting, Policy [Policy Text Block] Reverse repurchase agreements Repurchase Agreements [Member] Name Outstanding Recovery, Individual Name Per Accumulation Unit Data: Per Accumulation Unit Data: Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] TOTAL LIABILITIES Liabilities Discount Rate Measurement Input, Discount Rate [Member] Outstanding accumulation units, ownership percentage Outstanding Accumulation Units, Ownership Percentage Outstanding Accumulation Units, Ownership Percentage Geographical [Domain] Geographical [Domain] Investments, at fair value: Investments, at fair value: Vista Station Office Portfolio Vista Station Office Portfolio [Member] Vista Station Office Portfolio [Member] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name One Biscayne Tower Senior Loan One Biscayne Tower Senior Loan [Member] One Biscayne Tower Senior Loan Schedule of Investments [Table] Schedule of Investments [Table] Loans receivable Loans Receivable, Realized Gain (Loss) Loans Receivable, Realized Gain (Loss) Carrington Park Carrington Park [Member] Carrington Park Schedule of Outstanding Loans Payable Schedule Of Outstanding Mortgage Loans Payable Secured By Properties And Loans Payable [Table Text Block] Schedule Of Outstanding Mortgage Loans Payable Secured By Properties And Loans Payable [Table Text Block] Purchases and originations of loans receivable with related parties Payments for (Proceeds from) Loans Receivable, To (From) Related Party Payments for (Proceeds from) Loans Receivable, To (From) Related Party Total income (in dollars per share) Total Income Real Estate Per Accumulation Unit Total investment income from real estate per accumulation unit. Concentration Risk [Line Items] Concentration Risk [Line Items] Schedule of Fair Value of Net Unrealized Gains (Losses) Included in Changes in Net Assets Attributable to Investments and Loans Payable Using Significant Unobservable Inputs Fair Value Of Net Unrealized Gains Included In Changes In Net Assets Attributable To Investments, Mortgage Loans Payable And Loans Payable Using Significant Unobservable Inputs [Table Text Block] Tabular disclosure of the fair value measurement of net unrealized gains included in changes in net assets attributable to investments, mortgage loans payable and loans payable using significant unobservable inputs. Schedule of Unobservable Inputs Related to Level 3 Fair Value Measurements Schedule Of Unobservable Inputs Related To Level 3 Fair Value Measurements [Table Text Block] Tabular disclosure of unobservable inputs related to Level 3 fair value measurements. Loans payable principal outstanding Total Principal Outstanding Principal Outstanding On Mortgage Loans Payable And Loans Payable Principal Outstanding On Mortgage Loans Payable And Loans Payable Facility fee Line of Credit Facility, Commitment Fee Percentage Credit Facility [Domain] Credit Facility [Domain] Asset Class [Domain] Asset Class [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Due from investment manager Due From Investment Manager Represents amounts that due from related party investment advisor. Annuity payments Annuity Payments The net change during the reporting period in the aggregate amount of net assets from participant transactions relating to Annuity payments. U.S treasury securities US Treasury Securities [Member] Minimum percentage of noncontrolling ownership interest in joint ventures Minimum Percentage Of Noncontrolling Ownership Interest In Joint Ventures Minimum percentage of noncontrolling ownership interest in joint ventures. Debt securities, available-for-sale, measurement input, amount Debt Securities, Available-for-Sale, Measurement Input, Amount Debt Securities, Available-for-Sale, Measurement Input, Amount Maximum Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Real estate properties (cost: $13,026.0 and $12,973.4) Real estate properties Fair Value Of Real Estate Properties Fair value of real estate property held for investment purposes. Schedule of Reconciliation of Assets Measured at Fair Value on Recurring Basis, Unobservable Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] NUMBER OF ACCUMULATION UNITS OUTSTANDING (in shares) Accumulation Units outstanding at end of period (millions) (in shares) Beginning of period (in shares) End of period (in shares) Accumulation Units, Outstanding, End Of Period Represents the number of accumulation units outstanding at the reporting date. Current Period Leases, Lessor, Current Year [Abstract] Leases, Lessor, Current Year [Abstract] Loan receivable, with related parties, number of loans with a joint venture partner Loan Receivable, Related Party, Number Of Loans With Joint Venture Partner Loan Receivable, Related Party, Number Of Loans With Joint Venture Partner TOTAL INVESTMENT INCOME Total Investment Income Real Estate And Other Income derived from investments in Real Estate properties, Real Estate Joint Venture and Limited Partnerships and Real Estate related marketable securities, and other debt and equity securities. Award Timing Predetermined Award Timing Predetermined [Flag] Principal Outstanding Loans Receivable, At Cost, Including Related Party, Nonaccrual Loans Receivable, At Cost, Including Related Party, Nonaccrual Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1: Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] Grubb Southeast Real Estate Fund VI, LLC Grubb Southeast Real Estate Fund VI, LLC [Member] Grubb Southeast Real Estate Fund VI, LLC [Member] Schedule of Diversification of Portfolio by Region and Property Type Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Investment income, net (in dollars per share) Investment Income Net Of Fund Expenses Per Accumulation Unit Income net per accumulation unit. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Total Lessee, Operating Lease, Liability, to be Paid Capitalization Rate Measurement Input, Cap Rate [Member] Collateral Held [Domain] Collateral Held [Domain] All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Due to investment manager Due To Investment Manager Due To Investment Manager Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Table] Mortgage Loans Payable (Details) - Schedule of outstanding mortgage loans payable secured by properties [Table] Outstanding: Accumulation Units [Roll Forward] Accumulation Units Real Estate Joint Ventures Real Estate Joint Ventures [Member] Office Office Office [Member] Net change in unrealized gain (loss) on investments and debt Net change in unrealized gain (loss) on investments and debt Net change in unrealized (gain) loss on investments and debt Unrealized Gain (Loss) On Investments And Debt Unrealized Gain (Loss) On Investments And Debt Right-of-use assets, at fair value Operating Lease, Right-of-Use Asset Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Concentration Risk Type [Domain] Concentration Risk Type [Domain] Expenses: Expenses: Sales Comparison Approach Valuation Technique, Sales Comparison Approach [Member] Valuation Technique, Sales Comparison Approach Senior Notes, Series D And Series E Senior Notes, Series D And Series E [Member] Senior Notes, Series D And Series E Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Long-term line of credit Long-Term Line of Credit Minimum Minimum [Member] Series B Senior Notes, Series B [Member] Senior Notes, Series B JCR Capital - REA Preferred Equity Parallel Fund JCR Capital - REA Preferred Equity Parallel Fund [Member] JCR Capital - REA Preferred Equity Parallel Fund [Member] Investment Type [Axis] Investment Type [Axis] Expiration Date Trading Arrangement Expiration Date Total Level 3 Investments Total Level 3 Investments, Including Disposals [Member] Total Level 3 Investments, Including Disposals [Member] Total investments (cost: $22,100.3 and $22,373.0) Investments, Fair Value Disclosure Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Investments in Real Estate Funds Variable Interest Entity Disclosure [Text Block] LIABILITIES Liabilities [Abstract] Fair Value Loans Receivable, Fair Value Disclosure, Nonaccrual Loans Receivable, Fair Value Disclosure, Nonaccrual Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Decrease (Increase) in other investments Increase (Decrease) In Other Investments The net change during the reporting period in other investments not otherwise defined in the taxonomy. Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other Other Liabilities Related Party Affiliated Entity [Member] Other unsecured debt, at fair value (principal outstanding: $1,600.0 and $1,600.0) Unsecured Debt Real estate joint ventures at cost Real Estate Joint Ventures At Cost Real Estate Joint Ventures At Cost Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Apartment Apartment Building [Member] Thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Concentrations of Risk Concentration Risk Disclosure [Text Block] Investment management charges Investment Management Charges Charges related to investment advisory, investment management and portfolio accounting. Exercise Price Award Exercise Price INVESTMENT INCOME INVESTMENT INCOME Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Total return Total return Total rate of return of the Account during the stated period. Distribution charges Distribution Charges Distribution charges relate to services and expenses associated with distributing annuity contracts. Series C Senior Notes, Series C [Member] Senior Notes, Series C Document Quarterly Report Document Quarterly Report 2027 2026 Lessor, Operating Lease, Payment to be Received, Year One Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Lender Name [Axis] Lender Name [Axis] The Henley at Kingstowne The Henley at Kingstowne [Member] The Henley at Kingstowne BB- Standard & Poor's, BB- Rating [Member] Credit Facility Senior Notes Payable Debt Disclosure [Text Block] Total investments at cost Investment Owned, Cost Reverse Repurchase Agreements Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investment in Real Estate Operating Business Real Estate Disclosure [Text Block] Industrial Industrial Industrial [Member] Thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Measurement Input Type [Domain] Measurement Input Type [Domain] Total realized and unrealized gains (losses) included in changes in net assets Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Fair Value Fair Value Loans Receivable, Fair Value Disclosure Real estate taxes Real Estate Tax Expense Percentage of trigger point on outstanding accumulation units, percent Percentage Of Trigger Point On Outstanding Accumulation Units Percentage Of Trigger Point On Outstanding Accumulation Units Adoption Date Trading Arrangement Adoption Date Interest Rate Interest rate Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Payments for purchase of liquidity units Payments For Purchase Of Liquidity Units Payments For Purchase Of Liquidity Units NR NR, Not Assigned Internal Credit Rating [Member] NR, Not Assigned Internal Credit Rating [Member] Real Estate [Domain] Real Estate [Domain] NET INCREASE (DECREASE) IN NET ASSETS Increase (Decrease) In Net Assets Including Net Assets Resulting From Participant Transactions Increase (Decrease) In Net Assets Including Net Assets Resulting From Participant Transactions ASSETS Assets [Abstract] EBITDA Multiple Measurement Input, EBITDA Multiple [Member] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Schedule of Fair Value Based on Risk Ratings Financing Receivable Credit Quality Indicators [Table Text Block] Ground lease liabilities, at fair value Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] The Forum - Sam Houston The Forum - Sam Houston [Member] The Forum - Sam Houston Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Series A Senior Notes, Series A [Member] Senior Notes, Series A Five Oak Five Oak [Member] Five Oak Loans Receivable Loans Receivable [Member] Maximum percentage of annual contract rent of rental income (more than) Maximum Percentage Of Annual Contract Rent Of Rental Income The current maximum percentage of annual contract rent of the rental income held by a customer. Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND DEBT Realized And Unrealized Gain (Loss) On Investments, Mortgage Loans Payable, And Loans Payable Realized And Unrealized Gain (Loss) On Investments, Mortgage Loans Payable, And Loans Payable Contract duration Investment In Real Estate Operating Business, Contract Duration Investment In Real Estate Operating Business, Contract Duration Marketable Securities Marketable Securities [Member] Marketable Securities Marketplace at Mill Creek Marketplace At Mill Creek [Member] Marketplace At Mill Creek [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Real estate funds Unrealized Gain (Loss) On Real Estate Funds Unrealized Gain (Loss) On Real Estate Funds Other unsecured debt principal outstanding Principal Outstanding On Unsecured Debt Principal Outstanding On Unsecured Debt Number of operating segments Number of Operating Segments Entity Central Index Key Entity Central Index Key Weighted Average Weighted Average [Member] Real estate income, net Real Estate Income Net The aggregate revenue from real estate revenues during the reporting period net of real estate operating expenses and taxes. All Adjustments to Compensation All Adjustments to Compensation [Member] Park 10 Park 10 [Member] Park 10 Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] NET CASH PROVIDED BY OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Real estate operating business Unrealized Gain (Loss) On Real Estate Operating Business Unrealized Gain (Loss) On Real Estate Operating Business Interest rate, variable Investment Company, Basis Spread On Variable Rate Investment Company, Basis Spread On Variable Rate Income Statement [Abstract] Income Statement [Abstract] Debt extinguished in disposition of property Noncash Or Part Noncash, Debt Extinguished In Disposition Of Property Noncash Or Part Noncash, Debt Extinguished In Disposition Of Property TOTAL EXPENSES Total Fund Expenses Aggregate of fund expenses that includes Investment advisory charges, Administrative and distribution charges, Mortality and expense risk charges and Liquidity guarantee charges. Loans receivable at cost Loans Receivable, At Cost Cost of loan receivable held for investment purposes. Document Transition Report Document Transition Report Real estate income, net (in dollars per share) Real estate income, net Real estate revenues during the reporting period net of real estate operating expenses and taxes per accumulation unit. 1900 K Street, NW K Street 1900 NW [Member] 1900 K Street Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Investment, Name [Axis] Investment, Name [Axis] Loans Receivable Loans Receivable, Including Disposals [Member] Loans Receivable, Including Disposals [Member] Real estate funds Realized Gains (Losses) On Real Estate Funds, Net Realized Gains (Losses) On Real Estate Funds, Net Real estate funds at cost Real Estate Funds At Cost Real Estate Funds At Cost Death benefits Contract Owner Transactions, Death Benefits Contract Owner Transactions, Death Benefits Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net Present Value Net Present Value Valuation Technique [Member] Net present value (NPV) method used to appraise long-term projects using the time value of money. Unsecured Revolving Credit Facility and Term Loan Unsecured Revolving Credit Facility And Unsecured Debt [Member] Unsecured Revolving Credit Facility And Unsecured Debt Loan assignment as part of a real estate disposition Loan Assignment As Part Of A Real Estate Disposition Loan Assignment As Part Of A Real Estate Disposition Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Silverpeak NRE FundCo LLC Silverpeak NRE FundCo LLC [Member] Silverpeak NRE FundCo LLC Innovation Drive Innovation Drive [Member] Innovation Drive City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Real Estate Funds Real Estate Funds [Member] Ownership Percentage Real Estate Joint Venture, Ownership Percentage Real Estate Joint Venture, Ownership Percentage Geographic Concentration Risk Geographic Concentration Risk [Member] Taconic New York City GP Fund, LP Taconic New York City GP Fund, LP [Member] Taconic New York City GP Fund, LP [Member] All Individuals All Individuals [Member] LCS SHIP Venture I, LLC LCS SHIP Venture I, LLC [Member] LCS SHIP Venture I, LLC [Member] Subsequent Events Subsequent Events [Text Block] Other unsecured debt Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Thereafter Lessor, Operating Lease, Payment To Be Received, After Year Four Lessor, Operating Lease, Payment To Be Received, After Year Four Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Long-term debt, measurement input Long-Term Debt, Measurement Input Net change in unrealized gain (loss) on: Net change in unrealized appreciation (depreciation) on: NET ASSETS NET ASSETS TOTAL ASSETS Carrying Amount Assets FROM TRANSACTIONS BY CONTRACT OWNERS AND TIAA FROM PARTICIPANT TRANSACTIONS Interest expense Interest Expense, Operating MRA 34 LLC MRA 34 LLC [Member] MRA 34 LLC Retail Retail Retail [Member] Other income (in dollars per share) Other income Other revenue per accumulation unit. Industry Sector [Axis] Industry Sector [Axis] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Marketable securities purchases pending settlement Noncash Or Part Noncash, Marketable Securities Purchases Pending Settlement Noncash Or Part Noncash, Marketable Securities Purchases Pending Settlement Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Income from real estate funds Income From Real Estate Funds Income From Real Estate Funds Real Estate Properties Real Estate Properties [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Decrease (Increase) in other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] South United States, South [Member] United States, South Principal Investment Owned, Balance, Principal Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Marketable securities Marketable Securities, Portfolio Turnover Rate Marketable securities portfolio turnover rate is calculated by dividing the lesser of purchases or sales of securities, excluding securities having maturity dates at acquisition of one year or less, by the average value of the portfolio securities held during the period. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Interest expense (in dollars per share) Interest Expense, Excluding Real Estate Property Level Expenses, Per Accumulation Unit Interest Expense, Excluding Real Estate Property Level Expenses, Per Accumulation Unit Galvin Drive Galvin Drive [Member] Galvin Drive Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Award Timing Disclosures [Line Items] Entity Current Reporting Status Entity Current Reporting Status NET CASH USED IN FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Net Purchase Price Payments to Acquire Real Estate Marketable securities (cost: $1,656.2 and $1,728.6) Marketable securities excluding real estate-related Marketable Securities Excluding Real Estate Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale, excluding real estate. Investment income, net Investment income, net Ratio of average net assets to investment income net. Securities for reverse repurchase agreements Securities for Reverse Repurchase Agreements Loan to Value Ratio Loan to Value Ratio [Member] Loan to Value Ratio [Member] Loans Payable Mortgage Notes Payable And Loans Payable Disclosure [Text Block] Mortgage Notes Payable And Loans Payable Disclosure [Text Block] Proceeds from line of credit borrowings Proceeds from Long-Term Lines of Credit Adjustments to reconcile net changes in net assets resulting from operations to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Asset Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Asset Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Asset Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag A+ Standard & Poor's, A+ Rating [Member] Schedule of Real Estate Properties and Joint Ventures Schedule of Subsequent Events [Table Text Block] Real estate joint ventures Real Estate Joint Ventures Fair value of investments in real estate joint ventures . CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Real estate joint ventures Unrealized Gain (Loss) On Real Estate Joint Ventures Unrealized Gain (Loss) On Real Estate Joint Ventures Gilberts Gilberts [Member] Gilberts Winslow Bay Winslow Bay [Member] Winslow Bay [Member] Financial Instruments [Domain] Financial Instruments [Domain] Interest Rate Investment Company, Interest Rate, Stated Percentage Investment Company, Interest Rate, Stated Percentage MRA Hub 34 Holding, LLC MRA Hub 34 Holding, LLC MRA Hub 34 Holding, LLC [Member] MRA Hub 34 Holding, LLC [Member] Income from real estate joint ventures Income From Real Estate Joint Ventures Income From Real Estate Joint Ventures Maple Grove Maple Grove [Member] Maple Grove Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Line of credit principal outstanding Principal Outstanding On Line Of Credit Principal Outstanding On Line Of Credit Premiums Premiums Premiums The net change during the reporting period in the aggregate amount of net assets from participant transactions relating to premiums which include transfers into the Account. Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Maturity Mortgage Loans Payable Maturity Date The stated maturity date of the mortgage loan payable on real estate or a range of maturity dates for a group of loans. Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Distribution agreement, termination period Distribution Agreement, Termination Period Distribution Agreement, Termination Period Ashford Meadows Ashford Meadows [Member] Ashford Meadows Other Others [Member] West United States, West [Member] United States, West D Standard & Poor's, D Rating [Member] Related Party Transaction [Table] Related Party Transaction [Table] Equity Method Investment [Table] Equity Method Investment [Table] Net realized gain (loss) on investments and debt Net realized gain (loss) on investments and debt Net realized (gain) loss on investments Realized Gain (Loss) On Real Estate Investments And Debt Aggregate realized gain (loss) on real estate investments. Schedule of Callable Commitments Schedule Of Callable Commitments [Table Text Block] Schedule Of Callable Commitments [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items] Mortgage Loans Payable (Details) [Line Items] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Real estate property level expenses and taxes: Real estate property level expenses and taxes: Current Fiscal Year End Date Current Fiscal Year End Date One Biscayne One Biscayne [Member] One Biscayne C Standard & Poor's, C Rating [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount B Standard & Poor's, B Rating [Member] A Standard & Poor's, A Rating [Member] Collateral Held [Axis] Collateral Held [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Office Office Building [Member] Fair Value TOTAL LOANS RECEIVABLE WITH RELATED PARTIES Investment Owned, Fair Value Cash, cash equivalents and cash held by wholly owned properties Cash, Cash Equivalents, And Cash Held By Wholly Owned Properties At Carrying Value Cash, Cash Equivalents, And Cash Held By Wholly Owned Properties At Carrying Value Debt securities, available-for-sale, measurement input Debt Securities, Available-for-Sale, Measurement Input Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Investments in Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Real estate property level expenses (in dollars per share) Real Estate Property Level Expenses Real Estate Property Level Expenses Number of extension options Debt Instrument, Number Of Extension Options Debt Instrument, Number Of Extension Options Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Carrying Amount and Maximum Exposure to Loss Relating to VIEs Schedule of Variable Interest Entities [Table Text Block] BB+ Standard & Poor's, BB+ Rating [Member] NET ASSET VALUE, PER ACCUMULATION UNIT (in dollars per share) Beginning of period (in dollars per share) End of period (in dollars per share) Net Asset Value, Per Accumulation Unit Net asset value per accumulation unit. Arrived at by dividing accumulation fund by number of accumulation units outstanding. Series D Senior Notes, Series D [Member] Senior Notes, Series D Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Debt forgiven in disposition of property Noncash Or Part Noncash, Debt Forgiven In Disposition Of Property Noncash Or Part Noncash, Debt Forgiven In Disposition Of Property Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Portfolio turnover rate: Portfolio turnover rate(3): Real estate properties Gains (Losses) on Sales of Investment Real Estate Entity Small Reporting Company Entity Small Business 2029 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Subsequent Events [Abstract] Subsequent Events [Abstract] Accumulation Fund Accumulation Fund Represents the net assets attributable to participants in the accumulation phase of their investment. Net Sales Price Proceeds from Sale of Real Estate Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Number of options to extend maturity date for additional twelve months Debt Instrument, Number Of Options To Extend Maturity Date For Additional Twelve Months Debt Instrument, Number Of Options To Extend Maturity Date For Additional Twelve Months MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Silverpeak NRE FundCo 4 LLC Silverpeak NRE FundCo 4 LLC [Member] Silverpeak NRE FundCo 4 LLC Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Withdrawals Withdrawals Contract Owner Transactions, Withdrawals Contract Owner Transactions, Withdrawals JPMorgan Chase Bank Credit Facility Credit Agreement JPMorgan Chase Bank Credit Facility [Member] JPMorgan Chase Bank Credit Facility Fair Value as of Grant Date Award Grant Date Fair Value Ratios to Average net assets: Ratios to Average net assets(2): Real estate properties at cost Real Estate Properties At Cost Cost of real estate property held for investment. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Loans payable Unrealized Gain (Loss) On Mortgage Loans Payable And Loans Payable Unrealized Gain (Loss) On Mortgage Loans Payable And Loans Payable Operating Revenue and Expenses Operating Revenue and Expenses Real estate income, net: Real estate income, net: Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Organization and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Loans receivable Loans Receivable And Loans Receivable, Related Parties Fair value of loans receivable Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Rental income Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Executive Category: Executive Category [Axis] The Ashton The Ashton [Member] The Ashton Counterparty Name [Axis] Counterparty Name [Axis] Loan receivable forgiven or extinguished Noncash Or Part Noncash, Loan Receivable Forgiven Or Extinguished Noncash Or Part Noncash, Loan Receivable Forgiven Or Extinguished Capital improvements on real estate properties Payments For Capital Improvements, Operating Activities Payments For Capital Improvements, Operating Activities 2030 2029 Lessor, Operating Lease, Payment to be Received, Year Four Schedule of Major Categories of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Marketable securities at cost Other Marketable Securities At Cost Cost of marketable securities excluding real estate securities. 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Disclosures [Text Block] Variable Interest Entity [Table] Variable Interest Entity [Table] Level 3: Significant Unobservable Inputs Level 3: Significant Unobservable Inputs Fair Value, Inputs, Level 3 [Member] U.S. government agency notes US Government Agencies Debt Securities [Member] SUPPLEMENTAL DISCLOSURES Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Loans receivable, measurement input Loans Receivable, Measurement Input Loans Receivable, Measurement Input Geographical [Axis] Geographical [Axis] Restricted cash Restricted Cash Total Lessor, Operating Lease, Payment to be Received Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Real estate joint ventures Realized Gains (Losses) On Real Estate Joint Ventures, Net Realized Gains (Losses) On Real Estate Joint Ventures, Net Other Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Interest expense Interest Expense, Debt Liability Class [Axis] Liability Class [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Annuity Fund Annuity Fund Represents the net assets attributable to the participants currently receiving annuity payments. Beginning of period cash, cash equivalents, cash held by wholly owned properties and restricted cash End of period cash, cash equivalents, cash held by wholly owned properties and restricted cash TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Prepayment period, number of days prior to applicable maturity date Debt Instrument, Redemption Period, Number Of Days Prior To Applicable Maturity Date Debt Instrument, Redemption Period, Number Of Days Prior To Applicable Maturity Date Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code ABR Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Number of markets Number Of Markets Number Of Markets Townsend Group Value-Add Fund Townsend Group Value-Add Fund [Member] Townsend Group Value-Add Fund MR MCC 3 Sponsor, LLC MR MCC 3 Sponsor, LLC [Member] MR MCC 3 Sponsor, LLC Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Overlook At King Of Prussia Overlook At King Of Prussia [Member] Overlook At King Of Prussia [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Cash held by wholly owned properties Cash, Held By Wholly Owned Properties Cash, Held By Wholly Owned Properties Statistical Measurement [Axis] Statistical Measurement [Axis] TOTAL NET ASSETS Beginning of period End of period Net assets end of period (millions) Net Assets, Accumulation And Annuity Funds Carrying value as of the balance sheet date, aggregate of accumulation fund and annuity fund. Insider Trading Arrangements [Line Items] Conversion of loan receivable from related parties to equity Noncash Or Part Noncash, Conversion Of Loan Receivable From Related Parties To Equity Noncash Or Part Noncash, Conversion Of Loan Receivable From Related Parties To Equity Award Type Award Type [Axis] Price per projected unit Measurement Input, Price Per Projected Unit [Member] Measurement Input, Price Per Projected Unit 2026 Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] 32 South State Street 32 South State Street [Member] 32 South State Street Veritas - Trophy VI, LLC Veritas Trophy VI, LLC [Member] Veritas Trophy VI, LLC [Member] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Schedule of Limited Partners' Capital Account by Class [Table] Partners' Capital, Limited Partner's Capital Account, Class [Table] Property Name Real Estate, Type of Property [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating lease cost, related to ground leases Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Foreign Non-US [Member] Total % of Fair Value Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Loans Payable Loans Payable Loans Payable [Member] Expenses Real Estate Expenses Joint Ventures The aggregate expenses for joint ventures real estate operations during the reporting period. Equity Awards Adjustments Equity Awards Adjustments [Member] Loans Receivable, including those with related parties Loans Receivable, Including Related Party [Member] Loans Receivable, Including Related Party [Member] Portfolio Fair Value or Net Equity Value Portfolio Fair Value Or Net Equity Value [Member] Portfolio Fair Value Or Net Equity Value Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fort Point Creative Exchange Portfolio Fort Point Creative Exchange Portfolio [Member] Fort Point Creative Exchange Portfolio Real estate properties Real Estate Properties, Portfolio Turnover Rate Real estate investment portfolio turnover rate is calculated by dividing the lesser of purchases or sales of real estate property investments (including contributions to, or return of capital distributions received from, existing joint venture and limited partnership investments) by the average value of the portfolio of real estate investments held during the period. B+ Standard & Poor's, B+ Rating [Member] Industry Sector [Domain] Industry Sector [Domain] Schedule of Aggregate Minimum Annual Rental Payments Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Proceeds from payoffs of loans receivable Proceeds From Collection Of Loans Receivable, Operating Activities Proceeds From Collection Of Loans Receivable, Operating Activities (Decrease) Increase in other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] % of Net Assets Investment Owned, Net Assets, Percentage Schedule of Loans Receivable, Underlying Real Estate Collateral by Property Types Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Income Approach—Direct Capitalization Valuation Technique, Direct Capitalization [Member] Valuation Technique, Direct Capitalization Prior Year Leases, Lessee, Prior Year [Abstract] Leases, Lessee, Prior Year [Abstract] Net change in from/due to investment manager Increase (Decrease) In Due From Investment Advisor Net change during the reporting period in the carrying amount of receivables from investment advisor. NET (DECREASE) INCREASE IN NET ASSETS RESULTING FROM TRANSACTIONS BY CONTRACT OWNERS AND TIAA Increase (Decrease) In Net Assets From Contract Owner Transactions The net change during the reporting period in the aggregate amount of net assets from contract owner transactions. Net realized gain (loss) on: Net realized gain (loss) on investments Real Estate Properties Real Estate Properties, Including Disposals [Member] Real Estate Properties, Including Disposals [Member] The Ashton Venture The Ashton Venture [Member] The Ashton Venture Total realized and unrealized gains (losses) included in changes in net assets - loans payable Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Loans Payable Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Loans Payable Name Awards Close in Time to MNPI Disclosures, Individual Name Investment, Identifier [Axis] Investment, Identifier [Axis] Payments to acquire investments Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Investment company, committed capital, remaining fund, amount Investment Company, Additional Committed Capital Investment Company, Additional Committed Capital Marketable securities Debt Securities, Unrealized Gain (Loss) Loans Receivable with Related Parties Loans Receivable With Related Parties [Member] Loans Receivable With Related Parties Net increase (decrease) in Accumulation Unit Value (in dollars per share) Increase Decrease In Per Accumulation Unit Value The net change during the reporting period per accumulation unit. Market Approach Valuation, Market Approach [Member] Equivalency Rate Equivalency Rate [Member] Equivalency Rate [Member] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Payable for securities purchased Marketable Securities Excluding Real Estate, Payable Marketable Securities Excluding Real Estate, Payable Loans receivable with related parties at cost Loans Receivable, At Cost, Related Party Loan Receivable At Cost, Related Party Adjustment to Compensation: Adjustment to Compensation [Axis] Real Estate Properties and Joint Ventures Commercial Mortgage-Backed Securities [Member] TREA SV 355 West 52nd Street TREA SV 355 West 52nd Street [Member] TREA SV 355 West 52nd Street Credit Concentration Risk Credit Concentration Risk [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Administrative charges Administrative Charges Charges representing administration and operations of the Account and the contracts, including administrative services such as receiving and allocating premiums and calculating and making annuity payments. Revenues Revenues Joint Venture Revenues Joint Venture Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Foreign currency translation Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax Total real estate property level expenses Cost Of Real Estate Revenue Cost Of Real Estate Revenue Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Annuity, other periodic payments, withdrawals and death benefits (in shares) Annuity, Other Periodic Payments, Withdrawals And Death Benefits Represents the number of accumulation units paid during the reporting period for annuity, other periodic payments, withdrawals and death benefits. Name Measure Name Real Estate Operating Business Real Estate Operating Business [Member] Real Estate Operating Business Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Pay vs Performance Disclosure [Line Items] Principal Outstanding Loans Receivable, At Cost, Including Related Party Loans Receivable, At Cost, Including Related Party Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Debt Instrument [Line Items] Debt Instrument [Line Items] Purchases of real estate joint ventures, funds and operating business Payments To Acquire Real Estate Joint Ventures, Funds And Operating Business Payments To Acquire Real Estate Joint Ventures, Funds And Operating Business NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND DEBT NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS AND MORTGAGE LOANS PAYABLE [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Loans payable Loans Payable, Realized Gain (Loss) Loans Payable, Realized Gain (Loss) TOTAL COMMITMENTS Investment Company, Committed Capital Accrued real estate property expenses Accrued Liabilities 2030 Lessor, Operating Lease, Payment to be Received, Year Five Name Trading Arrangement, Individual Name Principal amounts outstanding Principal outstanding on mortgage loans payable Total aggregate Principal as of the balance sheet date of mortgage loans payable. Cash and cash equivalents Cash and Cash Equivalent Interest forgiven in disposition of property Noncash Or Part Noncash, Interest Forgiven In Disposition Of Property Noncash Or Part Noncash, Interest Forgiven In Disposition Of Property Weighted average interest rate Debt Instrument, Interest Rate During Period Alft Lane Alft Lane [Member] Alft Lane Account Interest Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Reserve at Chino Hills Reserve At Chino Hills [Member] Reserve At Chino Hills Investments, Debt and Equity Securities [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] SOFR Secured Overnight Financing Rate (SOFR) [Member] Number of Loans Loans Receivable, Number Of Loans, Nonaccrual Loans Receivable, Number Of Loans, Nonaccrual Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Weighted-average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Loans receivable with related parties (principal: $41.8 and $70.3) Loan Receivable, Related Party Loan Receivable, Related Party Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Residential Residential [Member] Residential Entity Address, Address Line One Entity Address, Address Line One Accumulation Unit Value: Accumulation Unit Value: Lombard Lombard [Member] Lombard Line of credit, at fair value (principal outstanding: $250.0 and $160.0) Line of credit Line of Credit Facility, Fair Value of Amount Outstanding Liberty Park Liberty Park [Member] Liberty Park Silverpeak NRE FundCo 3 LLC Silverpeak NRE FundCo 3 LLC [Member] Silverpeak NRE FundCo 3 LLC Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, CASH HELD BY WHOLLY OWNED PROPERTIES AND RESTRICTED CASH Net (decrease) increase in cash, cash equivalents, cash held by wholly owned properties and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 2028 2027 Lessor, Operating Lease, Payment to be Received, Year Two Number of data centers Number Of Data Centers Number Of Data Centers NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS Net increase in net assets resulting from operations Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Income Approach—Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] NET ASSETS NetAssetsAbstract0 Restatement Determination Date: Restatement Determination Date [Axis] BBB Standard & Poor's, BBB Rating [Member] BB Standard & Poor's, BB Rating [Member] Schedule of Loans Receivable in Nonaccrual Status Financing Receivable, Nonaccrual [Table Text Block] Interest income Investment Income, Interest Debt conversion, converted instrument, amount Debt Conversion, Converted Instrument, Amount Accumulated Units Disclosure [Abstract] Accumulated Units Disclosure [Abstract] Real estate operating business at cost Cost Real Estate Operating Business At Cost Real Estate Operating Business At Cost Loans receivable (principal: $707.4 and $945.1) Loans Receivable Fair value of loan receivable held for investment purposes. Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Fair value adjustment Fair Value Adjustment Total aggregate fair value adjustment on mortgage loans payable. Expense charges (in dollars per share) Expense Charges, Excluding Real Estate Property Level Expenses, Per Accumulation Unit Expense Charges per accumulation unit. Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Real Estate Operating Business Real Estate Operating Business, Including Disposals [Member] Real Estate Operating Business, Including Disposals Rental income (in dollars per share) Real Estate Revenue Per Accumulation Unit Revenue per accumulation unit from real estate operations. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]