Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Nonoperating Income (Expense) [Abstract]
Fees and Commissions, Other	$ 29	$ 27
Remarketing Fees	23	29
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	8	16
Income (Loss) from Equity Method Investments	6	0
Other Income	43	42
Noninterest Income, Other Operating Income	$ 109	$ 114