Other Assets (Schedule Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Assets [Abstract]
Property, Plant and Equipment, Gross	$ 956	$ 1,152
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(618)	(787)
Property, Plant and Equipment, Net	338	365
Nontrading Derivative Assets	4,608	5,687
Restricted cash collections for securitization trusts	1,755	1,596
Cash and securities collateral placed with counterparties	1,387	1,448
Restricted cash and cash equivalents	812	1,381
Cash reserve deposits held for securitization trusts	756	838
Goodwill	520	518
Unamortized Debt Issuance Expense	499	612
Other accounts receivable	494	1,110
Prepaid Expense and Other Assets	467	568
Real Estate Investments, Other	453	385
Nonmarketable equity securities	342	419
Accrued Investment Income Receivable	197	232
Retained Interest, Fair Value Disclosure	165	231
Servicer advances	98	2,142
Other Assets, Miscellaneous	1,045	1,209
Other Assets	$ 13,936	$ 18,741