Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Other Assets [Abstract]
Property and equipment at cost	$ 1,433	$ 1,433	$ 1,332
Accumulated depreciation, property and equipment	(748)	(748)	(686)
Net property and equipment	685	685	646
Accrued interest, fees, and rent receivables	1,125	1,125	589
Nonmarketable equity investments	1,080	1,080	1,232
Investments in qualified affordable housing projects	930	930	830
Restricted cash held for securitization trusts	760	760	738
Equity-method investments	361	361	358
Goodwill	343	343	393
Net deferred tax assets	161	161	58
Other accounts receivable	150	150	117
Restricted cash and cash equivalents	73	73	87
Net intangible assets	60	60	69
Fair value of derivative contracts in receivable position	14	14	64
Other assets	979	979	892
Total other assets	6,721	6,721	6,073
Federal Home Loan Bank stock	551	551	701
Federal Reserve Bank stock	449	449	449
Equity securities without a readily determinable fair value	80	80	82
Equity securities without readily determinable fair value, impairment loss, amount	4	5
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	10	10
Impairment related to equity securities without a readily determinable fair value	11	11
Qualified Affordable Housing Project Investments, Commitment	397	397	372
Intangible Assets, Gross (Excluding Goodwill)	111	111	111
Intangible assets, accumulated amortization	$ 51	$ 51	$ 42