Other Assets (Schedule Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Assets [Abstract]
Property, Plant and Equipment, Gross	$ 723	$ 709
Accumulated depreciation	(492)	(474)
Property, Plant and Equipment, Net	231	235
Restricted cash collections for securitization trusts	2,129	3,664
Deferred Tax Assets, State Taxes	1,918	2,040
Cash reserve deposits held for securitization trusts	388	402
Other accounts receivable	350	290
Unamortized Debt Issuance Expense	275	312
Derivative Asset, Fair Value, Gross Asset	252	362
Nonmarketable equity securities	236	337
Cash and securities collateral placed with counterparties	220	328
Off-lease Vehicles Held for Sale	203	158
Restricted cash and cash equivalents	175	205
Other Assets, Miscellaneous	1,013	1,256
Other Assets	$ 7,390	$ 9,589