Accumulation Units (Details) - shares shares in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Outstanding:
Beginning of period (in shares)	46.5	47.8
Credited for premiums (in shares)	1.4	6.1
Annuity, other periodic payments, withdrawals and death benefits (in shares)	(1.7)	(7.4)
End of period (in shares)	46.2	46.5

Represents the number of accumulation units paid during the reporting period for annuity, other periodic payments, withdrawals and death benefits.

No definition available.

Name:	tiaareal_AnnuityOtherPeriodicPaymentsWithdrawalsAndDeathBenefits
Namespace Prefix:	tiaareal_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration