Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities [Abstract]
Nontrading Derivative Liabilities	$ 4,711		$ 5,367
Cash collateral received from counterparties	942		1,410
Accounts Payable	876		1,178
ResCap settlement accrual	750		0
Accrued Employee Benefits	607		649
Accounts Payable, Related Parties	368		228
Taxes Payable	283		296
Accrued Income Taxes, Current	235		200
Representation And Warranty Obligations Reserve Balance	127	124	825	829	829	830
Deferred Revenue	119		86
Deferred Income Tax Liabilities	95		111
Loan repurchase liabilities	0		2,387
Other Accrued Liabilities	849		1,347
Accrued expenses and other liabilities	$ 9,962		$ 14,084