Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Abstract]
ResCap settlement accrual	$ 1,950	$ 750
Accounts Payable	513	565
Accrued Employee Benefits	462	494
Liability for Claims and Claims Adjustment Expense	299	341
Derivative Liability, Fair Value, Gross Liability	228	2,468
Cash collateral received from counterparties	125	941
Other Accrued Liabilities	1,259	1,026
Accrued expenses and other liabilities	4,836	6,585
ResCap settlement accrual for insurance proceeds	$ 150	$ 0