Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entities [Line Items]
Investments in securities, at fair value	$ 51,089	$ 50,825
Other assets	13,106	13,387
Other liabilities	(12,463)	(13,206)
Assets	4,317,460	4,305,288
Total unpaid principal balance of mortgage loans	4,072,636	4,075,598
Multifamily
Variable Interest Entities [Line Items]
Total unpaid principal balance of mortgage loans	436,307	431,440
Multifamily | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Total unpaid principal balance of mortgage loans	436,300
Mortgage-related | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Investments in securities, at fair value	2,992	3,353
Other assets	40	40
Other liabilities	(45)	(45)
Net carrying amount	2,987	3,348
Maximum exposure to loss	235,000	240,000
Assets	241,000	240,000
Partnership interest LIHTC | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Net carrying amount	429	424
Maximum exposure to loss	433	427
Assets	4,300	4,300
Total available-for-sale securities | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Maximum exposure to loss	18,100	16,900
Assets	$ 18,200	$ 17,000