Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Other Assets [Abstract]
Property and equipment at cost	$ 1,355	$ 1,332
Accumulated depreciation, property and equipment	(714)	(686)
Property and equipment, net	641	646
Nonmarketable equity securities	1,324	1,232
Other accounts receivable	1,303	117
Investments in qualified affordable housing projects	924	830
Restricted cash collections for securitization trusts	843	738
Accrued interest, late fees, and rent receivables	669	589
Goodwill	393	393
Equity method investments	350	358
Deferred tax assets, net	227	58
Net intangible assets	64	69
Restricted cash and cash equivalents	62	87
Fair value of derivative contracts in receivable position	10	64
Other assets, other	1,168	892
Total other assets	7,978	6,073
Federal Home Loan Bank stock	793	701
Federal Reserve Bank stock	449	449
Equity securities without a readily determinable fair value	82	82
Equity securities without readily determinable fair value, impairment loss, amount	1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	10
Impairment related to equity securities without a readily determinable fair value	7
Qualified Affordable Housing Project Investments, Commitment	408	372
Intangible Assets, Gross (Excluding Goodwill)	111	111
Intangible assets, accumulated depreciation	$ 47	$ 42