Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	$ 2,212	$ 2,801
Maximum exposure to loss in nonconsolidated VIEs	2,633	3,163
Total consoldiated involvement with VIEs	45,622	50,311
Other Assets	6,126	7,302
Consumer Loans Auto Financing Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	29,398	31,994
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Assets of nonconsolidated variable interest entities	2,212	2,801
Maximum exposure to loss in nonconsolidated VIEs	2,212	2,801
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	10,300	12,700
Commercial Automobile [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	16,038	18,171
Commercial Other [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	186	146
Assets of nonconsolidated variable interest entities	0	0
Maximum exposure to loss in nonconsolidated VIEs	421	362
Other Assets	202	164
Accrued Liabilities	$ 16	$ 18