Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Expenses [Abstract]
Insurance Commissions	$ 95	$ 95	$ 283	$ 279
Communications and Information Technology	65	77	198	255
Lease And Loan Administration	31	32	92	92
Marketing and Advertising Expense	26	27	80	81
Professional Fees	23	20	68	73
Depreciation, Nonproduction	20	23	62	61
Regulatory and licensing fees	18	23	59	69
Vehicle remarketing and repossession	20	22	56	61
Occupancy, Net	13	12	38	34
Non-Income Taxes	11	12	26	32
Other Cost and Expense, Operating	56	61	166	176
Total other operating expenses	$ 378	$ 404	$ 1,128	$ 1,213