Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (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
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,139	$ 1,140	$ 2,274	$ 2,233
Interest on loans held-for-sale	3	20	19	51
Interest on trading assets	0	1	0	10
Interest and dividends on available-for-sale investment securities	76	77	144	151
Interest-bearing cash	2	9	5	11
Operating leases	788	561	1,522	1,068
Total financing revenue and other interest income	2,008	1,808	3,964	3,524
Interest on deposits	162	160	326	323
Interest on short-term borrowings	16	19	32	36
Interest on long-term debt	703	837	1,404	1,717
Total interest expense	881	1,016	1,762	2,076
Depreciation expense on operating lease assets	499	335	934	640
Net financing revenue (loss)	628	457	1,268	808
Nonbank subsidiaries	0	0	0	0
Servicing fees	19	113	101	235
Servicing asset valuation and hedge activities, net	(12)	46	(213)	(60)
Total servicing income, net	7	159	(112)	175
Insurance premiums and service revenue earned	258	261	517	531
Gain (loss) on mortgage and automotive loans, net	(1)	86	37	106
Other gain (loss) on investments, net	64	64	115	153
Other income, net of losses	74	144	231	354
Total other revenue	402	714	788	1,319
Total net revenue (loss)	1,030	1,171	2,056	2,127
Provision for loan losses	89	33	220	131
Compensation and benefits expense	252	270	537	573
Insurance losses and loss adjustment expenses	146	149	261	247
Other operating expenses	403	552	961	1,006
Total noninterest expense	801	971	1,759	1,826
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	140	167	77	170
Income tax expense (benefit) from continuing operations	40	(16)	(83)	(15)
Net income (loss) from continuing operations	100	183	160	185
Income (loss) from discontinued operations, net of tax	(1,027)	(1,081)	6	(773)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	(927)	(898)	166	(588)
Other comprehensive income (loss), net of tax	(181)	(206)	(498)	(19)
Comprehensive income (loss)	(1,108)	(1,104)	(332)	(607)
Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest-bearing cash	0	0	0	0
Interest Expense, Debt	0	0	0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	272	198	431	451
Interest on loans held-for-sale	0	6	0	11
Interest on trading assets		0		0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	1	6	2	7
Operating leases	118	35	214	87
Total financing revenue and other interest income	404	264	684	613
Interest on deposits	6	16	15	33
Interest on short-term borrowings	12	13	24	33
Interest on long-term debt	564	664	1,124	1,387
Total interest expense	603	697	1,183	1,452
Depreciation expense on operating lease assets	102	18	164	31
Net financing revenue (loss)	(301)	(451)	(663)	(870)
Nonbank subsidiaries	1,864	179	5,163	320
Servicing fees	38	50	82	102
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	38	50	82	102
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	(3)	0	(4)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	26	61	77	96
Total other revenue	64	108	159	194
Total net revenue (loss)	1,627	(164)	4,659	(356)
Provision for loan losses	105	(20)	229	58
Compensation and benefits expense	160	182	352	395
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	99	805	157	891
Total noninterest expense	259	987	509	1,286
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	1,263	(1,131)	3,921	(1,700)
Income tax expense (benefit) from continuing operations	(231)	(280)	(560)	(548)
Net income (loss) from continuing operations	1,494	(851)	4,481	(1,152)
Income (loss) from discontinued operations, net of tax	(1,242)	9	(1,507)	19
Undistributed income of bank subsidiaries	207	275	433	498
Undistributed income of nonbank subsidiaries	(1,386)	(331)	(3,241)	47
Net income (loss)	(927)	(898)	166	(588)
Other comprehensive income (loss), net of tax	(181)	(206)	(498)	(19)
Comprehensive income (loss)	(1,108)	(1,104)	(332)	(607)
Parent [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	13	19	37	57
Interest-bearing cash	0	0	0	0
Interest Expense, Debt	21	4	20	(1)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on loans held-for-sale	0	0	0	0
Interest on trading assets		0		0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	0	0	0	0
Operating leases	0	0	0	0
Total financing revenue and other interest income	0	(1)	0	0
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	0
Total interest expense	0	0	0	1
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	(1)	0	(1)
Nonbank subsidiaries	405	0	3,659	0
Servicing fees	0	0	0	0
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	0	0	0	0
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	0	0	0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	0	110	0	254
Total other revenue	0	110	0	254
Total net revenue (loss)	405	109	3,659	253
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	109	0	253
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	0	0	0
Total noninterest expense	0	109	0	253
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	405	0	3,659	0
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	405	0	3,659	0
Income (loss) from discontinued operations, net of tax	(47)	3	(34)	6
Undistributed income of bank subsidiaries	207	275	433	498
Undistributed income of nonbank subsidiaries	(348)	114	(2,400)	199
Net income (loss)	217	392	1,658	703
Other comprehensive income (loss), net of tax	(141)	(155)	(719)	(29)
Comprehensive income (loss)	76	237	939	674
Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	(1)	0	0
Interest-bearing cash	0	0	0	0
Interest Expense, Debt	0	0	0	1
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	867	938	1,843	1,782
Interest on loans held-for-sale	3	14	19	40
Interest on trading assets		1		10
Interest and dividends on available-for-sale investment securities	76	77	144	151
Interest-bearing cash	1	3	3	4
Operating leases	670	526	1,308	981
Total financing revenue and other interest income	1,639	1,573	3,346	2,990
Interest on deposits	156	144	311	290
Interest on short-term borrowings	4	2	8	3
Interest on long-term debt	139	177	285	338
Total interest expense	313	345	644	698
Depreciation expense on operating lease assets	397	317	770	609
Net financing revenue (loss)	929	911	1,932	1,683
Nonbank subsidiaries	0	0	0	0
Servicing fees	(19)	63	19	133
Servicing asset valuation and hedge activities, net	(12)	46	(213)	(60)
Total servicing income, net	(31)	109	(194)	73
Insurance premiums and service revenue earned	258	261	517	531
Gain (loss) on mortgage and automotive loans, net	(1)	89	37	110
Other gain (loss) on investments, net	64	64	115	153
Other income, net of losses	341	259	766	604
Total other revenue	631	782	1,241	1,471
Total net revenue (loss)	1,560	1,693	3,173	3,154
Provision for loan losses	(16)	53	(9)	73
Compensation and benefits expense	194	89	417	179
Insurance losses and loss adjustment expenses	146	149	261	247
Other operating expenses	496	(77)	1,184	461
Total noninterest expense	836	161	1,862	887
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	740	1,479	1,320	2,194
Income tax expense (benefit) from continuing operations	271	264	477	533
Net income (loss) from continuing operations	469	1,215	843	1,661
Income (loss) from discontinued operations, net of tax	262	(1,094)	1,546	(796)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	731	121	2,389	865
Other comprehensive income (loss), net of tax	(253)	(425)	(854)	(37)
Comprehensive income (loss)	478	(304)	1,535	828
Non-Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	20	5	25	13
Interest-bearing cash	2	9	4	9
Interest Expense, Debt	14	22	40	67
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	4	0	0
Interest on loans held-for-sale	0	0	0	0
Interest on trading assets		0		0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	0	0	0	0
Operating leases	0	0	0	0
Total financing revenue and other interest income	(35)	(28)	(66)	(79)
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	4	0	0
Interest on long-term debt	0	(4)	(5)	(8)
Total interest expense	(35)	(26)	(65)	(75)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	(2)	(1)	(4)
Nonbank subsidiaries	(2,269)	(179)	(8,822)	(320)
Servicing fees	0	0	0	0
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	0	0	0	0
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	0	0	0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(293)	(286)	(612)	(600)
Total other revenue	(293)	(286)	(612)	(600)
Total net revenue (loss)	(2,562)	(467)	(9,435)	(924)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(102)	(110)	(232)	(254)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(192)	(176)	(380)	(346)
Total noninterest expense	(294)	(286)	(612)	(600)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(2,268)	(181)	(8,823)	(324)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(2,268)	(181)	(8,823)	(324)
Income (loss) from discontinued operations, net of tax	0	1	1	(2)
Undistributed income of bank subsidiaries	(414)	(550)	(866)	(996)
Undistributed income of nonbank subsidiaries	1,734	217	5,641	(246)
Net income (loss)	(948)	(513)	(4,047)	(1,568)
Other comprehensive income (loss), net of tax	394	580	1,573	66
Comprehensive income (loss)	(554)	67	(2,474)	(1,502)
Consolidation, Eliminations [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(33)	(23)	(62)	(70)
Interest-bearing cash	(2)	(9)	(4)	(9)
Interest Expense, Debt	$ (35)	$ (26)	$ (60)	$ (67)