Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Nonoperating Income (Expense) [Abstract]
Remarketing Fees	$ 104	$ 103	$ 101
Fees and Commissions, Other	102	98	90
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	51	64	45
Income (Loss) from Equity Method Investments	14	18	52
Other Income	137	111	71
Noninterest Income, Other Operating Income	$ 408	$ 394	$ 359