Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Remarketing Fees	$ 27	$ 25	$ 56	$ 53
Fees and Commissions, Other	25	22	52	47
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	14	18	30	31
Income (Loss) from Equity Method Investments	5	5	5	11
Other Income	32	26	75	49
Noninterest Income, Other Operating Income	$ 103	$ 96	$ 218	$ 191