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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 1,197	$ 1,546	$ 1,170	$ 1,503
Charge-offs	(166)	(174)	(333)	(357)
Recoveries	63	86	116	162
Allowance for Loan and Lease Losses, Provision for Loss, Net	(103)	(88)	(217)	(195)
Provision for Loan, Lease, and Other Losses	89	33	220	131
Provision for Other Losses	0	(64)	10	(12)
Allowance for loan losses, Ending Balance	1,183	1,427	1,183	1,427
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	262	207	262	207
Allowance for loan losses, Collectively evaluated for impairment	921	1,214	921	1,214
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	6	0	6
Finance receivables and loans, net	96,993	119,913	96,993	119,913	99,055
Financing Receivable, Individually Evaluated for Impairment	1,509	2,310	1,509	2,310
Financing receivable, Collectively evaluated for impairment	95,468	117,544	95,468	117,544
Financing receivable, Loans acquired with deteriorated credit quality	16	59	16	59
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	599	832	575	766
Charge-offs	(133)	(130)	(275)	(266)
Recoveries	53	60	102	122
Allowance for Loan and Lease Losses, Provision for Loss, Net	(80)	(70)	(173)	(144)
Provision for Loan, Lease, and Other Losses	92	18	199	101
Provision for Other Losses	(1)	(2)	9	55
Allowance for loan losses, Ending Balance	610	778	610	778
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	22	9	22	9
Allowance for loan losses, Collectively evaluated for impairment	588	763	588	763
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	6	0	6
Finance receivables and loans, net	56,028	68,136	56,028	68,136
Financing Receivable, Individually Evaluated for Impairment	268	97	268	97
Financing receivable, Collectively evaluated for impairment	55,744	67,980	55,744	67,980
Financing receivable, Loans acquired with deteriorated credit quality	16	59	16	59
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, Beginning balance	451	501	452	516
Charge-offs	(31)	(41)	(55)	(86)
Recoveries	5	4	8	6
Allowance for Loan and Lease Losses, Provision for Loss, Net	(26)	(37)	(47)	(80)
Provision for Loan, Lease, and Other Losses	6	21	26	48
Provision for Other Losses	0	(13)	0	(12)
Allowance for loan losses, Ending Balance	431	472	431	472
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	214	166	214	166
Allowance for loan losses, Collectively evaluated for impairment	217	306	217	306
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	9,270	9,823	9,270	9,823
Financing Receivable, Individually Evaluated for Impairment	936	688	936	688
Financing receivable, Collectively evaluated for impairment	8,334	9,135	8,334	9,135
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	147	213	143	221
Charge-offs	(2)	(3)	(3)	(5)
Recoveries	5	22	6	34
Allowance for Loan and Lease Losses, Provision for Loss, Net	3	19	3	29
Provision for Loan, Lease, and Other Losses	(9)	(6)	(5)	(18)
Provision for Other Losses	1	(49)	1	(55)
Allowance for loan losses, Ending Balance	142	177	142	177
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	26	32	26	32
Allowance for loan losses, Collectively evaluated for impairment	116	145	116	145
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	31,695	41,954	31,695	41,954
Financing Receivable, Individually Evaluated for Impairment	305	1,525	305	1,525
Financing receivable, Collectively evaluated for impairment	31,390	40,429	31,390	40,429
Financing receivable, Loans acquired with deteriorated credit quality	0	0	0	0
Foreign [Member] | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs		(45)		(81)
Recoveries		18		34
Foreign [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(1)	(2)	(1)	(2)
Recoveries		20		25
Segment, Discontinued Operations [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for Loan, Lease, and Other Losses		$ (4)		$ 37