Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	$ 659	$ 899
Maximum exposure to loss in nonconsolidated VIEs	949	939
Total consoldiated involvement with VIEs	38,709	40,123
Other Assets	6,758	9,589
Consumer Loans Auto Financing Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	20,590	19,072
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Assets of nonconsolidated variable interest entities	659	899
Maximum exposure to loss in nonconsolidated VIEs	659	899
Commercial Automobile [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	18,008	20,511
Commercial Other [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	564
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	111	(24)
Assets of nonconsolidated variable interest entities	0	0
Maximum exposure to loss in nonconsolidated VIEs	290	40
Other Assets	134	0
Accrued Liabilities	$ 23	$ 24