Other Operating Expenses (Details Of Other Operating Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Cost and Expense Disclosure, Operating [Abstract]
Insurance Commissions	$ 92	$ 99
Mortgage Representation And Warranty, Net	83	0
Lease and loan administration	81	54
Communications and Information Technology	71	89
Professional Fees	48	38
Marketing and Advertising Expense	35	35
Regulatory and licensing fees	33	33
Depreciation, Nonproduction	20	17
Vehicle remarketing and repossession	14	16
Occupancy, Net	11	14
State and local non-income taxes	10	9
Other Cost and Expense, Operating	60	50
Total other operating expenses	$ 558	$ 454