Other Assets (Schedule Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Assets [Abstract]
Property, Plant and Equipment, Gross	$ 675	$ 693
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(441)	(411)
Property, Plant and Equipment, Net	234	282
Deferred Tax Assets, State Taxes	1,967	1,190
Restricted cash collections for securitization trusts	1,213	2,983
Cash reserve deposits held for securitization trusts	432	442
Unamortized Debt Issuance Expense	392	425
Other accounts receivable	345	525
Derivative Asset, Fair Value, Gross Asset	310	2,298
Restricted cash and cash equivalents	237	889
Cash and securities collateral placed with counterparties	224	1,290
Nonmarketable equity securities	204	303
Other Assets, Miscellaneous	1,143	1,281
Other Assets	$ 6,701	$ 11,908