Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Other Assets [Abstract]
Property and equipment at cost	$ 2,075	$ 2,075	$ 1,541
Accumulated depreciation	(917)	(917)	(815)
Net property and equipment	1,158	1,158	726
Investment in qualified affordable housing projects	1,341	1,341	1,095
Nonmarketable equity investments	931	931	915
Net deferred tax assets	852	852	94
Accrued interest, fees, and rent receivables	580	580	704
Restricted cash held for securitization trusts	567	567	875
Equity-method investments	402	402	320
Goodwill	343	343	343
Other accounts receivable	158	158	166
Operating lease right-of-use assets	148	148	162
Restricted cash and cash equivalents	57	57	78
Net intangible assets	37	37	50
Fair value of derivative contracts in receivable position	9	9	17
Other assets	869	869	870
Total other assets	7,452	7,452	6,415
Federal Home Loan Bank stock	224	224	276
Federal Reserve Bank stock	449	449	449
Equity securities without a readily determinable fair value	258	258	189
Annual adjustment amount	1	83
Equity securities without readily determinable fair value, impairment loss, amount		1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	178	178
Impairment related to equity securities without a readily determinable fair value	12	12
Gross intangible assets	109	109	109
Intangible assets, accumulated amortization	$ 72	$ 72	$ 59