Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Expenses [Abstract]
Insurance Commissions	$ 99	$ 95	$ 290	$ 283
Communications and Information Technology	70	65	203	198
Lease And Loan Administration	34	31	100	92
Marketing and Advertising Expense	27	26	75	80
Professional Fees	25	23	75	68
Vehicle remarketing and repossession	24	20	70	56
Regulatory and licensing fees	26	18	68	59
Depreciation, Nonproduction	19	20	61	62
Occupancy, Net	13	13	38	38
Taxes, Miscellaneous	10	11	27	26
Other Cost and Expense, Operating	71	56	182	166
Other Noninterest Expense	$ 418	$ 378	$ 1,189	$ 1,128