Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Remarketing Fees	$ 26	$ 26	$ 82	$ 79
Fees and Commissions, Other	25	25	77	72
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	11	18	41	49
Income (Loss) from Equity Method Investments	7	3	12	14
Other Income	26	26	101	75
Noninterest Income, Other Operating Income	$ 95	$ 98	$ 313	$ 289