Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Expenses [Abstract]
Insurance Commissions	$ 97	$ 95	$ 191	$ 188
Communications and Information Technology	67	64	133	133
Lease And Loan Administration	34	32	66	61
Professional Fees	26	25	50	45
Marketing and Advertising Expense	21	23	48	54
Vehicle remarketing and repossession	22	18	46	37
Depreciation, Nonproduction	21	22	42	42
Regulatory and licensing fees	21	20	42	41
Occupancy, Net	12	13	25	24
Non-Income Taxes	8	7	17	15
Other Cost and Expense, Operating	57	47	111	110
Total other operating expenses	$ 386	$ 366	$ 771	$ 750