Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Other Assets [Abstract]
Property and equipment at cost	$ 1,620	$ 1,541
Accumulated depreciation, property and equipment	(844)	(815)
Net property and equipment	776	726
Restricted cash held for securitization trusts	1,173	875
Investments in qualified affordable housing projects	1,086	1,095
Nonmarketable equity investments	889	915
Accrued interest, fees, and rent receivables	608	704
Equity-method investments	370	320
Goodwill	343	343
Finance lease, right-of-use assets	337	0
Net deferred tax assets	263	94
Operating lease right-of-use assets	150	162
Other accounts receivable	139	166
Restricted cash and cash equivalents	80	78
Net intangible assets	46	50
Fair value of derivative contracts in receivable position	18	17
Other assets	889	870
Total other assets	7,167	6,415
Federal Home Loan Bank stock	248	276
Federal Reserve Bank stock	449	449
Equity securities without a readily determinable fair value	192	189
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	2
Equity securities without readily determinable fair value, impairment loss, amount	1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	117
Impairment related to equity securities without a readily determinable fair value	13
Intangible Assets, Gross (Excluding Goodwill)	109	109
Intangible assets, accumulated amortization	$ 63	$ 59