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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	$ 1,171	$ 1,183	$ 1,208	$ 1,170
Allowance for Loan and Lease Losses, Write-offs	(201)	(184)	(554)	(517)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	52	58	187	174
Allowance for Loan and Lease Losses Write-offs, Net	(149)	(126)	(367)	(343)
Allowance for Loan and Lease Losses, Provision for Loss, Net	102	141	302	361
Allowance for Loan and Lease Losses, Adjustments, Net	(11)	0	(30)	10
Loans and Leases Receivable, Allowance, Ending Balance	1,113	1,198	1,113	1,198
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	220	249	220	249
Allowance for loan losses, Collectively evaluated for impairment	893	949	893	949
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	99,518	95,281	99,518	95,281	100,328
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	99,517		99,517		100,327
Financing Receivable, Individually Evaluated for Impairment	1,266	1,436	1,266	1,436
Financing receivable, Collectively evaluated for impairment	98,249	93,834	98,249	93,834
Financing receivable, Loans acquired with deteriorated credit quality	2	11	2	11
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	729	610	673	575
Allowance for Loan and Lease Losses, Write-offs	(188)	(168)	(511)	(443)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	51	53	170	155
Allowance for Loan and Lease Losses Write-offs, Net	(137)	(115)	(341)	(288)
Allowance for Loan and Lease Losses, Provision for Loss, Net	112	156	372	355
Allowance for Loan and Lease Losses, Adjustments, Net	(11)	0	(11)	9
Loans and Leases Receivable, Allowance, Ending Balance	693	651	693	651
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	25	22	25	22
Allowance for loan losses, Collectively evaluated for impairment	668	629	668	629
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	58,675	56,450	58,675	56,450
Financing Receivable, Individually Evaluated for Impairment	289	269	289	269
Financing receivable, Collectively evaluated for impairment	58,384	56,170	58,384	56,170
Financing receivable, Loans acquired with deteriorated credit quality	2	11	2	11
Residential Mortgage [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	302	431	389	452
Allowance for Loan and Lease Losses, Write-offs	(13)	(16)	(38)	(71)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1	5	6	13
Allowance for Loan and Lease Losses Write-offs, Net	(12)	(11)	(32)	(58)
Allowance for Loan and Lease Losses, Provision for Loss, Net	(7)	(12)	(55)	14
Allowance for Loan and Lease Losses, Adjustments, Net	0	(1)	(19)	(1)
Loans and Leases Receivable, Allowance, Ending Balance	283	407	283	407
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	180	199	180	199
Allowance for loan losses, Collectively evaluated for impairment	103	208	103	208
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	7,594	8,772	7,594	8,772
Financing Receivable, Individually Evaluated for Impairment	904	916	904	916
Financing receivable, Collectively evaluated for impairment	6,690	7,856	6,690	7,856
Financing receivable, Loans acquired with deteriorated credit quality	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	140	142	146	143
Allowance for Loan and Lease Losses, Write-offs	0	0	(5)	(3)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0	0	11	6
Allowance for Loan and Lease Losses Write-offs, Net	0	0	6	3
Allowance for Loan and Lease Losses, Provision for Loss, Net	(3)	(3)	(15)	(8)
Allowance for Loan and Lease Losses, Adjustments, Net	0	1	0	2
Loans and Leases Receivable, Allowance, Ending Balance	137	140	137	140
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	15	28	15	28
Allowance for loan losses, Collectively evaluated for impairment	122	112	122	112
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	33,248	30,059	33,248	30,059
Financing Receivable, Individually Evaluated for Impairment	73	251	73	251
Financing receivable, Collectively evaluated for impairment	33,175	29,808	33,175	29,808
Financing receivable, Loans acquired with deteriorated credit quality	$ 0	$ 0	$ 0	$ 0