Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Other Assets [Abstract]
Property and equipment at cost	$ 1,668	$ 1,668	$ 1,541
Accumulated depreciation	(877)	(877)	(815)
Net property and equipment	791	791	726
Investment in qualified affordable housing projects	1,261	1,261	1,095
Nonmarketable equity investments	939	939	915
Net deferred tax assets	889	889	94
Restricted cash held for securitization trusts	702	702	875
Accrued interest, fees, and rent receivables	572	572	704
Equity-method investments	382	382	320
Goodwill	343	343	343
Finance lease right-of-use assets	327	327	0
Operating lease right-of-use assets	142	142	162
Other accounts receivable	128	128	166
Restricted cash and cash equivalents	79	79	78
Net intangible assets	41	41	50
Fair value of derivative contracts in receivable position	16	16	17
Other assets	893	893	870
Total other assets	7,505	7,505	6,415
Federal Home Loan Bank stock	239	239	276
Federal Reserve Bank stock	449	449	449
Equity securities without a readily determinable fair value	251	251	189
Annual adjustment amount	81	81
Equity securities without readily determinable fair value, impairment loss, amount	1	1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	176	176
Impairment related to equity securities without a readily determinable fair value	13	13
Gross intangible assets	109	109	109
Intangible assets, accumulated amortization	$ 68	$ 68	$ 59