Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Expenses [Abstract]
Insurance Commissions	$ 99	$ 94
Communications and Information Technology	69	66
Lease And Loan Administration	36	32
Marketing and Advertising Expense	30	27
Vehicle remarketing and repossession	28	24
Regulatory and licensing fees	27	21
Professional Fees	26	24
Depreciation, Nonproduction	22	21
Occupancy, Net	12	13
Taxes, Miscellaneous	8	9
Other Cost and Expense, Operating	48	54
Other Noninterest Expense	$ 405	$ 385