Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entities [Line Items]
Investments in securities, at fair value	$ 53,116	$ 50,825
Other assets	13,490	13,387
Other liabilities	(14,106)	(13,206)
Total assets	4,325,437	4,305,288
Unpaid principal balance of mortgage loans	4,102,632	4,075,598
Not Primary Beneficiary | Mortgage-related
Variable Interest Entities [Line Items]
Investments in securities, at fair value	4,863	3,353
Other assets	37	40
Other liabilities	(42)	(45)
Net carrying amount	4,858	3,348
Maximum exposure to loss	223,000	240,000
Total assets	273,000	240,000
Not Primary Beneficiary | Partnership interest
Variable Interest Entities [Line Items]
Net carrying amount	528	424
Maximum exposure to loss	530	427
Total assets	5,800	4,300
Not Primary Beneficiary | Available-for-sale securities:
Variable Interest Entities [Line Items]
Maximum exposure to loss	21,400	16,900
Total assets	21,400	17,000
Multifamily
Variable Interest Entities [Line Items]
Unpaid principal balance of mortgage loans	461,247	$ 431,440
Multifamily | Not Primary Beneficiary
Variable Interest Entities [Line Items]
Unpaid principal balance of mortgage loans	$ 461,200