Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Other assets	$ 11,031	$ 10,855
Other liabilities	(13,149)	(14,432)
Assets	4,289,453	4,229,166
Total unpaid principal balance of mortgage loans	4,058,654	3,899,025
Multifamily
Variable Interest Entities [Line Items]
Total unpaid principal balance of mortgage loans	420,312	403,452
Multifamily | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Total unpaid principal balance of mortgage loans	420,300
Mortgage-related securities | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Investments in securities	3,713	4,709
Other assets	41	35
Other liabilities	(48)	(41)
Net carrying amount	3,706	4,703
Maximum exposure to loss	246,000	220,000
Assets	250,000	250,000
Partnership interest LIHTC | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Net carrying amount	395	288
Maximum exposure to loss	399	292
Assets	4,100	3,700
Total available-for-sale securities | Unconsolidated VIEs
Variable Interest Entities [Line Items]
Maximum exposure to loss	17,400	10,400
Assets	$ 17,500	$ 10,400