Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 1,170	$ 1,503
Charge-offs	(167)	(183)
Recoveries	53	76
Allowance for Loan and Lease Losses, Provision for Loss, Net	(114)	(107)
Provision for Loan, Lease, and Other Losses	131	98
Provision for Other Losses	10	52
Allowance for loan losses, Ending Balance	1,197	1,546
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	259	223
Allowance for loan losses, Collectively evaluated for impairment	936	1,315
Allowance for loan losses, Loans acquired with deteriorated credit quality	2	8
Finance receivables and loans, net	99,123	118,986	99,055
Financing Receivable, Individually Evaluated for Impairment	2,600	1,074
Financing receivable, Collectively evaluated for impairment	96,501	117,841
Financing receivable, Loans acquired with deteriorated credit quality	22	71
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	575	766
Charge-offs	(142)	(136)
Recoveries	49	62
Allowance for Loan and Lease Losses, Provision for Loss, Net	(93)	(74)
Provision for Loan, Lease, and Other Losses	107	83
Provision for Other Losses	10	57
Allowance for loan losses, Ending Balance	599	832
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	22	8
Allowance for loan losses, Collectively evaluated for impairment	575	816
Allowance for loan losses, Loans acquired with deteriorated credit quality	2	8
Finance receivables and loans, net	55,014	67,214
Financing Receivable, Individually Evaluated for Impairment	270	88
Financing receivable, Collectively evaluated for impairment	54,722	67,055
Financing receivable, Loans acquired with deteriorated credit quality	22	71
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	452	516
Charge-offs	(24)	(45)
Recoveries	3	2
Allowance for Loan and Lease Losses, Provision for Loss, Net	(21)	(43)
Provision for Loan, Lease, and Other Losses	20	27
Provision for Other Losses	0	1
Allowance for loan losses, Ending Balance	451	501
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	209	168
Allowance for loan losses, Collectively evaluated for impairment	242	333
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0
Finance receivables and loans, net	9,672	9,958
Financing Receivable, Individually Evaluated for Impairment	933	619
Financing receivable, Collectively evaluated for impairment	8,739	9,339
Financing receivable, Loans acquired with deteriorated credit quality	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	143	221
Charge-offs	(1)	(2)
Recoveries	1	12
Allowance for Loan and Lease Losses, Provision for Loss, Net	0	10
Provision for Loan, Lease, and Other Losses	4	(12)
Provision for Other Losses	0	(6)
Allowance for loan losses, Ending Balance	147	213
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	28	47
Allowance for loan losses, Collectively evaluated for impairment	119	166
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0
Finance receivables and loans, net	34,437	41,814
Financing Receivable, Individually Evaluated for Impairment	1,397	367
Financing receivable, Collectively evaluated for impairment	33,040	41,447
Financing receivable, Loans acquired with deteriorated credit quality	0	0
Foreign [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs		36
Recoveries		16
Foreign [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Recoveries		5
Segment, Discontinued Operations [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for Loan, Lease, and Other Losses		$ 42