Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies ResCap Deconsolidation - Assets, Liabilities, and AOCI (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	May 14, 2012 ResCap LLC [Member]
ResCap Bankruptcy, Removal of Assets, Liabilities, and AOCI [Line Items]
Cash and Due from Banks	$ 2,106		$ 2,475				$ 494
Interest-bearing Deposits in Banks and Other Financial Institutions	14,020		10,560				45
Total cash and cash equivalents	16,126		13,035	14,901		11,670	539
Trading assets	0		622				31
Loans held-for-sale, net	2,000		8,557				4,103
Finance receivables and loans, net	119,913		114,755				743
Loans and Leases Receivable, Allowance	(1,427)		(1,503)				(9)
Total finance receivables and loans, net	118,486		113,252				734
Mortgage servicing rights	1,105	2,595	2,519	3,701	3,774	3,738	1,130
Premiums receivable and other insurance assets	1,887		1,853				4
Other assets	14,010		18,741				5,365
Total assets	178,560		184,059	178,889			11,906
Short-term borrowings	6,010		7,680				788
Long-term debt	91,096		92,794				5,428
Interest payable	1,552		1,587				157
Reserves for insurance losses and loss adjustment expenses	477		580				89
Accrued expenses and other liabilities	10,198		14,084				5,002
Total liabilities	160,197		164,688				11,464
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax							$ 20