Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Expenses [Abstract]
Insurance Commissions	$ 110	$ 99
Communications and Information Technology	71	69
Lease And Loan Administration	42	36
Marketing and Advertising Expense	39	30
Vehicle remarketing and repossession	32	28
Professional Fees	32	26
Federal Deposit Insurance Corporation Premium Expense	30	27
Depreciation, Nonproduction	20	22
Occupancy, Net	11	12
Taxes, Miscellaneous	8	8
Amortization of Intangible Assets	3	3
Other Cost and Expense, Operating	47	45
Other Noninterest Expense	$ 445	$ 405