Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	$ 933	$ 1,192	$ 977	$ 1,208
Allowance for Loan and Lease Losses, Write-offs	(175)	(157)	(390)	(353)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	75	72	140	135
Allowance for Loan and Lease Losses Write-offs, Net	(100)	(85)	(250)	(218)
Allowance for Loan and Lease Losses, Provision for Loss, Net	140	63	256	200
Allowance for Loan and Lease Losses, Adjustments, Net	1	1	(9)	(19)
Loans and Leases Receivable, Allowance, Ending Balance	974	1,171	974	1,171
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	91	233	91	233
Allowance for loan losses, Collectively evaluated for impairment	883	938	883	938
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	105,173		105,173		$ 99,948
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	105,172	100,777	105,172	100,777	$ 99,947
Financing Receivable, Individually Evaluated for Impairment	639	1,310	639	1,310
Financing receivable, Collectively evaluated for impairment	104,533	99,464	104,533	99,464
Financing receivable, Loans acquired with deteriorated credit quality	0	3	0	3
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	711	715	685	673
Allowance for Loan and Lease Losses, Write-offs	(166)	(143)	(359)	(323)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	70	60	131	119
Allowance for Loan and Lease Losses Write-offs, Net	(96)	(83)	(228)	(204)
Allowance for Loan and Lease Losses, Provision for Loss, Net	152	97	310	260
Allowance for Loan and Lease Losses, Adjustments, Net	0	0	0	0
Loans and Leases Receivable, Allowance, Ending Balance	767	729	767	729
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	22	26	22	26
Allowance for loan losses, Collectively evaluated for impairment	745	703	745	703
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	60,786	58,114	60,786	58,114
Financing Receivable, Individually Evaluated for Impairment	275	287	275	287
Financing receivable, Collectively evaluated for impairment	60,511	57,824	60,511	57,824
Financing receivable, Loans acquired with deteriorated credit quality	0	3	0	3
Residential Mortgage [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	119	333	152	389
Allowance for Loan and Lease Losses, Write-offs	(9)	(10)	(31)	(25)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	5	2	8	5
Allowance for Loan and Lease Losses Write-offs, Net	(4)	(8)	(23)	(20)
Allowance for Loan and Lease Losses, Provision for Loss, Net	3	(25)	(2)	(48)
Allowance for Loan and Lease Losses, Adjustments, Net	1	2	(8)	(19)
Loans and Leases Receivable, Allowance, Ending Balance	119	302	119	302
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	50	192	50	192
Allowance for loan losses, Collectively evaluated for impairment	69	110	69	110
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	9,211	7,846	9,211	7,846
Financing Receivable, Individually Evaluated for Impairment	265	925	265	925
Financing receivable, Collectively evaluated for impairment	8,946	6,921	8,946	6,921
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	103	144	140	146
Allowance for Loan and Lease Losses, Write-offs	0	(4)	0	(5)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0	10	1	11
Allowance for Loan and Lease Losses Write-offs, Net	0	6	1	6
Allowance for Loan and Lease Losses, Provision for Loss, Net	(15)	(9)	(52)	(12)
Allowance for Loan and Lease Losses, Adjustments, Net	0	(1)	(1)	0
Loans and Leases Receivable, Allowance, Ending Balance	88	140	88	140
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, Individually evaluated for impairment	19	15	19	15
Allowance for loan losses, Collectively evaluated for impairment	69	125	69	125
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0
Finance receivables and loans, net	35,175	34,817	35,175	34,817
Financing Receivable, Individually Evaluated for Impairment	99	98	99	98
Financing receivable, Collectively evaluated for impairment	35,076	34,719	35,076	34,719
Financing receivable, Loans acquired with deteriorated credit quality	$ 0	$ 0	$ 0	$ 0