Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $)	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	$ 1,829,000,000		$ 51,757,000,000
Maximum exposure to loss in nonconsolidated VIEs	1,979,000,000		48,860,000,000
Total consoldiated involvement with VIEs	45,887,000,000		51,094,000,000
Mortgage loans held-for-sale	1,377,000,000		8,112,000,000
Other assets	14,010,000,000		18,741,000,000
Mortgage servicing rights	1,105,000,000	2,595,000,000	2,519,000,000	3,701,000,000	3,774,000,000	3,738,000,000
Excess Servicing Rights Sold to Variable Interest Entity					266
Total finance receivables and loans, net	118,486,000,000		113,252,000,000
Consumer Loans Auto Financing Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	26,852,000,000		26,504,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0
Assets of nonconsolidated variable interest entities	1,829,000,000
Maximum exposure to loss in nonconsolidated VIEs	1,829,000,000
Commercial Automobile [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	18,371,000,000		19,594,000,000
Other [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets			956,000,000
Consumer Mortgage Other Member
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0		0
Assets of nonconsolidated variable interest entities	0		0
Maximum exposure to loss in nonconsolidated VIEs	15,000,000		17,000,000
Government National Mortgage Association (GNMA) [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets			2,652,000,000
Assets of nonconsolidated variable interest entities			44,127,000,000
Maximum exposure to loss in nonconsolidated VIEs			44,127,000,000
Canada Mortgage and Housing Corporation [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets			66,000,000
Assets of nonconsolidated variable interest entities			3,222,000,000
Maximum exposure to loss in nonconsolidated VIEs			66,000,000
Private Placement [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets			1,098,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets			141,000,000
Assets of nonconsolidated variable interest entities			4,408,000,000
Maximum exposure to loss in nonconsolidated VIEs			4,408,000,000
Commercial Other [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	656,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	8,000,000		83,000,000
Assets of nonconsolidated variable interest entities	0		0
Maximum exposure to loss in nonconsolidated VIEs	135,000,000		242,000,000
Other assets	36,000,000		20,000,000
Total finance receivables and loans, net	0		100,000,000
Accrued expenses and other liabilities	28,000,000		37,000,000
Off Balance Sheet Variable Interest Entities Member | Residential Mortgage [Member]
Variable Interest Entity [Line Items]
Mortgage loans held-for-sale	0		2,400,000,000
Other assets	0		92,000,000
Mortgage servicing rights	$ 0		$ 386,000,000