Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Abstract]
ResCap settlement accrual	$ 1,950	$ 750
Accounts Payable	906	565
Accrued Employee Benefits	455	494
Liability for Claims and Claims Adjustment Expense	314	341
Derivative Liability, Fair Value, Gross Liability	220	2,468
Cash collateral received from counterparties	177	941
Other Accrued Liabilities	1,021	1,026
Accrued expenses and other liabilities	5,043	6,585
ResCap settlement accrual for insurance proceeds	$ 150