Other Operating Expenses (Details Of Other Operating Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Cost and Expense Disclosure, Operating [Abstract]
Impairment and Accruals Related to Deconsolidation of Residential Capital, LLC	$ 1,192	$ 0	$ 1,192	$ 0
Communications and Information Technology	109	115	235	234
Insurance Commissions	107	116	219	234
Professional services	93	77	209	143
Foreclosed Real Estate Expense	90	0	90	0
Lease and loan administration	64	45	110	89
Marketing and Advertising Expense	36	41	75	95
Regulatory and licensing fees	33	34	69	71
Depreciation, Nonproduction	24	24	49	50
Occupancy, Net	21	22	45	44
Vehicle remarketing and repossession	20	37	45	72
Mortgage Representation And Warranty, Net	18	184	37	210
State and local non-income taxes	5	35	29	66
Other Cost and Expense, Operating	121	162	245	330
Other Noninterest Expense	1,933	892	2,649	1,638
Impairment of Investment in ResCap			442
Cash Contribution to ResCap	$ 750		$ 750