Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 1,546	$ 1,806	$ 1,503	$ 1,873
Charge-offs	(174)	(207)	(357)	(485)
Recoveries	86	86	162	175
Allowance for Loan and Lease Losses, Provision for Loss, Net	(88)	(121)	(195)	(310)
Provision for loan losses	29	50	169	163
Provision for loan losses - discontinued operations		1		1
Deconsolidation of Loans, Net	(9)		(9)
Provision for Loan, Lease, and Other Losses	(51)	3	(41)	12
Allowance for loan losses, Ending Balance	1,427	1,739	1,427	1,739
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	207	151	207	151
Allowance for loan losses, Collectively evaluated for impairment	1,214	1,576	1,214	1,576
Allowance for loan losses, Loans acquired with deteriorated credit quality	6	12	6	12
Finance Receivables Historical Cost Ending Balance	119,913	109,779	119,913	109,779
Financing Receivable, Individually Evaluated for Impairment	2,310	1,619	2,310	1,619
Financing receivable, Collectively evaluated for impairment	117,544	108,037	117,544	108,037
Financing receivable, Loans acquired with deteriorated credit quality	59	123	59	123
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	832	916	766	970
Charge-offs	(130)	(128)	(266)	(309)
Recoveries	60	68	122	137
Allowance for Loan and Lease Losses, Provision for Loss, Net	(70)	(60)	(144)	(172)
Provision for loan losses	45	51	178	104
Provision for loan losses - discontinued operations		0		0
Deconsolidation of Loans, Net	0		0
Provision for Loan, Lease, and Other Losses	(29)	4	(22)	9
Allowance for loan losses, Ending Balance	778	911	778	911
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	9	0	9	0
Allowance for loan losses, Collectively evaluated for impairment	763	899	763	899
Allowance for loan losses, Loans acquired with deteriorated credit quality	6	12	6	12
Finance Receivables Historical Cost Ending Balance	68,136	58,735	68,136	58,735
Financing Receivable, Individually Evaluated for Impairment	97	0	97	0
Financing receivable, Collectively evaluated for impairment	67,980	58,612	67,980	58,612
Financing receivable, Loans acquired with deteriorated credit quality	59	123	59	123
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	501	563	516	580
Charge-offs	(41)	(50)	(86)	(110)
Recoveries	4	6	6	9
Allowance for Loan and Lease Losses, Provision for Loss, Net	(37)	(44)	(80)	(101)
Provision for loan losses	20	38	48	78
Provision for loan losses - discontinued operations		1		1
Deconsolidation of Loans, Net	(9)		(9)
Provision for Loan, Lease, and Other Losses	(3)	0	(3)	0
Allowance for loan losses, Ending Balance	472	558	472	558
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	166	94	166	94
Allowance for loan losses, Collectively evaluated for impairment	306	464	306	464
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance Receivables Historical Cost Ending Balance	9,823	10,412	9,823	10,412
Financing Receivable, Individually Evaluated for Impairment	688	549	688	549
Financing receivable, Collectively evaluated for impairment	9,135	9,863	9,135	9,863
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	213	327	221	323
Charge-offs	(3)	(29)	(5)	(66)
Recoveries	22	12	34	29
Allowance for Loan and Lease Losses, Provision for Loss, Net	19	(17)	29	(37)
Provision for loan losses	(36)	(39)	(57)	(19)
Provision for loan losses - discontinued operations		0		0
Deconsolidation of Loans, Net	0		0
Provision for Loan, Lease, and Other Losses	(19)	(1)	(16)	3
Allowance for loan losses, Ending Balance	177	270	177	270
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	32	57	32	57
Allowance for loan losses, Collectively evaluated for impairment	145	213	145	213
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance Receivables Historical Cost Ending Balance	41,954	40,632	41,954	40,632
Financing Receivable, Individually Evaluated for Impairment	1,525	1,070	1,525	1,070
Financing receivable, Collectively evaluated for impairment	40,429	39,562	40,429	39,562
Financing receivable, Loans acquired with deteriorated credit quality	0	0	0	0
Domestic [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(127)	(155)	(274)	(360)
Recoveries	48	63	103	122
Domestic [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(85)	(95)	(185)	(234)
Recoveries	42	51	88	101
Domestic [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(41)	(48)	(86)	(108)
Recoveries	4	6	6	9
Domestic [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(1)	(12)	(3)	(18)
Recoveries	2	6	9	12
Foreign [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(47)	(52)	(83)	(125)
Recoveries	38	23	59	53
Foreign [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(45)	(33)	(81)	(75)
Recoveries	18	17	34	36
Foreign [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0	(2)	0	(2)
Recoveries	0	0	0	0
Foreign [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(2)	(17)	(2)	(48)
Recoveries	$ 20	$ 6	$ 25	$ 17