Loans Receivable - Schedule of Loans Receivable in Nonaccrual Status (Details) $ in Millions	Sep. 30, 2026 USD ($) loan
Receivables [Abstract]
Number of Loans \| loan	6
Principal Outstanding	$ 258.8
Fair Value	$ 5.3

Loans Receivable, At Cost, Including Related Party, Nonaccrual

No definition available.

Name:	tiaareal_LoansReceivableAtCostIncludingRelatedPartyNonaccrual
Namespace Prefix:	tiaareal_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant