Other Operating Expenses (Details Of Other Operating Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Cost and Expense Disclosure, Operating [Abstract]
Insurance Commissions	$ 106	$ 116	$ 325	$ 350
Lease and loan administration	94	47	204	136
Communications and Information Technology	86	127	321	361
Professional Fees	69	83	278	226
Marketing and Advertising Expense	38	46	114	141
Regulatory and licensing fees	33	32	101	102
Mortgage Representation And Warranty, Net	30	70	67	280
Depreciation, Nonproduction	24	24	73	73
Vehicle remarketing and repossession	20	32	65	104
State and local non-income taxes	23	29	52	95
Occupancy, Net	17	25	62	69
Impairment and Accruals Related to Deconsolidation of Residential Capital, LLC	0	0	1,192	0
Other Cost and Expense, Operating	79	123	414	455
Other Noninterest Expense	619	754	3,268	2,392
Impairment of Investment in ResCap			442
Cash Contribution to ResCap			$ 750