Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 1,427	$ 1,739	$ 1,503	$ 1,873
Charge-offs	(194)	(203)	(551)	(688)
Recoveries	69	80	231	255
Allowance for Loan and Lease Losses, Provision for Loss, Net	(125)	(123)	(320)	(433)
Provision for loan losses	116	50	285	213
Provision for loan losses - discontinued operations		(1)
Deconsolidation of Loans, Net			(9)
Provision for Loan, Lease, and Other Losses	5	(44)	(36)	(32)
Allowance for loan losses, Ending Balance	1,423	1,621	1,423	1,621
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	220	176	220	176
Allowance for loan losses, Collectively evaluated for impairment	1,199	1,435	1,199	1,435
Allowance for loan losses, Loans acquired with deteriorated credit quality	4	10	4	10
Finance Receivables Historical Cost Ending Balance	121,259	107,871	121,259	107,871
Financing Receivable, Individually Evaluated for Impairment	2,497	1,350	2,497	1,350
Financing receivable, Collectively evaluated for impairment	118,722	106,417	118,722	106,417
Financing receivable, Loans acquired with deteriorated credit quality	40	104	40	104
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	778	911	766	970
Charge-offs	(158)	(134)	(424)	(443)
Recoveries	62	63	184	200
Allowance for Loan and Lease Losses, Provision for Loss, Net	(96)	(71)	(240)	(243)
Provision for loan losses	117	53	295	157
Provision for loan losses - discontinued operations		0
Deconsolidation of Loans, Net			0
Provision for Loan, Lease, and Other Losses	4	(42)	(18)	(33)
Allowance for loan losses, Ending Balance	803	851	803	851
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	10	2	10	2
Allowance for loan losses, Collectively evaluated for impairment	789	839	789	839
Allowance for loan losses, Loans acquired with deteriorated credit quality	4	10	4	10
Finance Receivables Historical Cost Ending Balance	70,847	59,705	70,847	59,705
Financing Receivable, Individually Evaluated for Impairment	97	52	97	52
Financing receivable, Collectively evaluated for impairment	70,710	59,549	70,710	59,549
Financing receivable, Loans acquired with deteriorated credit quality	40	104	40	104
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	472	558	516	580
Charge-offs	(33)	(56)	(119)	(166)
Recoveries	2	5	8	14
Allowance for Loan and Lease Losses, Provision for Loss, Net	(31)	(51)	(111)	(152)
Provision for loan losses	6	26	54	104
Provision for loan losses - discontinued operations		(1)
Deconsolidation of Loans, Net			(9)
Provision for Loan, Lease, and Other Losses	0	0	(3)	0
Allowance for loan losses, Ending Balance	447	532	447	532
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	172	125	172	125
Allowance for loan losses, Collectively evaluated for impairment	275	407	275	407
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance Receivables Historical Cost Ending Balance	9,787	10,269	9,787	10,269
Financing Receivable, Individually Evaluated for Impairment	738	600	738	600
Financing receivable, Collectively evaluated for impairment	9,049	9,669	9,049	9,669
Financing receivable, Loans acquired with deteriorated credit quality	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	177	270	221	323
Charge-offs	(3)	(13)	(8)	(79)
Recoveries	5	12	39	41
Allowance for Loan and Lease Losses, Provision for Loss, Net	2	(1)	31	(38)
Provision for loan losses	(7)	(29)	(64)	(48)
Provision for loan losses - discontinued operations		0
Deconsolidation of Loans, Net			0
Provision for Loan, Lease, and Other Losses	1	(2)	(15)	1
Allowance for loan losses, Ending Balance	173	238	173	238
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	38	49	38	49
Allowance for loan losses, Collectively evaluated for impairment	135	189	135	189
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance Receivables Historical Cost Ending Balance	40,625	37,897	40,625	37,897
Financing Receivable, Individually Evaluated for Impairment	1,662	698	1,662	698
Financing receivable, Collectively evaluated for impairment	38,963	37,199	38,963	37,199
Financing receivable, Loans acquired with deteriorated credit quality	0	0	0	0
Domestic [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(147)	(157)	(421)	(517)
Recoveries	44	53	147	175
Domestic [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(111)	(97)	(296)	(331)
Recoveries	41	45	129	146
Domestic [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(33)	(54)	(119)	(162)
Recoveries	2	4	8	13
Domestic [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(3)	(6)	(6)	(24)
Recoveries	1	4	10	16
Foreign [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(47)	(46)	(130)	(171)
Recoveries	25	27	84	80
Foreign [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(47)	(37)	(128)	(112)
Recoveries	21	18	55	54
Foreign [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0	(2)	0	(4)
Recoveries	0	1	0	1
Foreign [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0	(7)	(2)	(55)
Recoveries	$ 4	$ 8	$ 29	$ 25