Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	$ 2,032	$ 899
Maximum exposure to loss in nonconsolidated VIEs	2,323	939
Total consoldiated involvement with VIEs	49,951	40,123
Other Assets	6,752	9,589
Consumer Loans Auto Financing Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	33,331	19,072
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Assets of nonconsolidated variable interest entities	2,032	899
Maximum exposure to loss in nonconsolidated VIEs	2,032	899
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	14,300
Commercial Automobile [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	16,499	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	121	(24)
Assets of nonconsolidated variable interest entities	0	0
Maximum exposure to loss in nonconsolidated VIEs	291	40
Other Assets	143	0
Accrued Liabilities	$ 22	$ 24