Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Expenses [Abstract]
Insurance Commissions	$ 104	$ 97	$ 203	$ 191
Communications and Information Technology	71	67	140	133
Lease And Loan Administration	39	34	75	66
Marketing and Advertising Expense	33	21	63	48
Regulatory and licensing fees	28	21	55	42
Vehicle remarketing and repossession	25	22	53	46
Professional Fees	27	26	53	50
Depreciation, Nonproduction	23	21	45	42
Occupancy, Net	11	12	23	25
Taxes, Miscellaneous	8	8	16	17
Other Cost and Expense, Operating	51	57	99	111
Other Noninterest Expense	$ 420	$ 386	$ 825	$ 771