Other Assets (Schedule Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets [Abstract]
Property, Plant and Equipment, Gross	$ 903	$ 1,152
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(592)	(787)
Property, Plant and Equipment, Net	311	365
Nontrading Derivative Assets	4,874	5,687
Restricted cash collections for securitization trusts	1,695	1,596
Cash and securities collateral placed with counterparties	1,323	1,448
Restricted cash and cash equivalents	875	1,381
Cash reserve deposits held for securitization trusts	742	838
Debt issuance costs	551	612
Goodwill	518	518
Prepaid expenses and deposits	471	568
Real estate and other investments	428	385
Other accounts receivable	419	1,110
Nonmarketable equity securities	374	419
Interests retained in financial asset sales	193	231
Accrued Investment Income Receivable	191	232
Servicer advances	91	2,142
Other Assets, Miscellaneous	954	1,209
Other Assets	$ 14,010	$ 18,741