Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Expenses [Abstract]
Insurance Commissions	$ 389	$ 378	$ 374
Communications and Information Technology	274	267	334
Lease And Loan Administration	136	126	122
Marketing and Advertising Expense	112	107	111
Professional Fees	103	93	100
Vehicle remarketing and repossession	95	78	83
Regulatory and licensing fees	94	79	87
Depreciation, Nonproduction	84	82	81
Occupancy, Net	51	50	47
Taxes, Miscellaneous	25	29	40
Other Cost and Expense, Operating	242	216	212
Other Noninterest Expense	$ 1,605	$ 1,505	$ 1,591