Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,119	$ 1,141	$ 3,393	$ 3,374
Interest on loans held-for-sale	0	23	19	74
Interest on trading assets	0	0	0	10
Interest and dividends on available-for-sale investment securities	85	64	229	215
Interest-bearing cash	3	8	8	19
Operating leases	832	631	2,354	1,699
Total financing revenue and other interest income	2,039	1,867	6,003	5,391
Interest on deposits	163	158	489	481
Interest on short-term borrowings	15	20	47	56
Interest on long-term debt	609	851	2,013	2,568
Total interest expense	787	1,029	2,549	3,105
Depreciation expense on operating lease assets	515	366	1,449	1,006
Net financing revenue (loss)	737	472	2,005	1,280
Nonbank subsidiaries	0	0	0	0
Servicing fees	13	91	114	326
Servicing asset valuation and hedge activities, net	0	134	(213)	74
Total servicing income, net	13	225	(99)	400
Insurance premiums and service revenue earned	251	262	768	793
Gain (loss) on mortgage and automotive loans, net	15	142	52	248
Gains (Losses) on Extinguishment of Debt	(42)	0	(42)	0
Other gain (loss) on investments, net	41	(23)	156	130
Other income, net of losses	93	169	324	523
Total other revenue	371	775	1,159	2,094
Total net revenue (loss)	1,108	1,247	3,164	3,374
Provision for loan losses	141	105	361	236
Compensation and benefits expense	245	257	782	830
Insurance losses and loss adjustment expenses	85	90	346	337
Other operating expenses	432	498	1,393	1,504
Total noninterest expense	762	845	2,521	2,671
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	205	297	282	467
Income tax expense (benefit) from continuing operations	28	46	(55)	31
Net income (loss) from continuing operations	177	251	337	436
Income (loss) from discontinued operations, net of tax	(86)	133	(80)	(640)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	91	384	257	(204)
Other comprehensive income (loss), net of tax	4	218	(494)	199
Comprehensive income (loss)	95	602	(237)	(5)
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	243	228	674	679
Interest on loans held-for-sale		4	0	15
Interest on trading assets				0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	1	7	3	14
Operating leases	141	50	355	137
Total financing revenue and other interest income	397	312	1,081	925
Interest on deposits	5	14	20	47
Interest on short-term borrowings	11	15	35	48
Interest on long-term debt	469	680	1,593	2,067
Total interest expense	508	710	1,691	2,162
Depreciation expense on operating lease assets	103	29	267	60
Net financing revenue (loss)	(214)	(427)	(877)	(1,297)
Nonbank subsidiaries	54	99	5,217	419
Servicing fees	36	46	118	148
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	36	46	118	148
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	2	0	(2)
Gains (Losses) on Extinguishment of Debt	(42)		(42)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	51	48	128	144
Total other revenue	45	96	204	290
Total net revenue (loss)	(115)	(232)	4,544	(588)
Provision for loan losses	69	55	298	113
Compensation and benefits expense	153	175	505	570
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	119	95	276	986
Total noninterest expense	272	270	781	1,556
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(456)	(557)	3,465	(2,257)
Income tax expense (benefit) from continuing operations	(189)	(304)	(749)	(852)
Net income (loss) from continuing operations	(267)	(253)	4,214	(1,405)
Income (loss) from discontinued operations, net of tax	152	(8)	(1,355)	11
Undistributed income of bank subsidiaries	235	231	668	729
Undistributed income of nonbank subsidiaries	(29)	414	(3,270)	461
Net income (loss)	91	384	257	(204)
Other comprehensive income (loss), net of tax	4	218	(494)	199
Comprehensive income (loss)	95	602	(237)	(5)
Guarantor Subsidiaries [Member]
Condensed Income 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
Interest on trading assets				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	0	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	0	0	(1)
Nonbank subsidiaries	0	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
Gains (Losses) on Extinguishment of Debt	0		0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	0	120	0	374
Total other revenue	0	120	0	374
Total net revenue (loss)	0	120	3,659	373
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	121	0	374
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	1	0	1
Total noninterest expense	0	122	0	375
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	0	(2)	3,659	(2)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	0	(2)	3,659	(2)
Income (loss) from discontinued operations, net of tax	15	0	(19)	6
Undistributed income of bank subsidiaries	235	231	668	729
Undistributed income of nonbank subsidiaries	5	62	(2,395)	261
Net income (loss)	255	291	1,913	994
Other comprehensive income (loss), net of tax	(34)	241	(753)	212
Comprehensive income (loss)	221	532	1,160	1,206
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	876	913	2,719	2,695
Interest on loans held-for-sale		19	19	59
Interest on trading assets				10
Interest and dividends on available-for-sale investment securities	85	64	229	215
Interest-bearing cash	2	1	5	5
Operating leases	691	581	1,999	1,562
Total financing revenue and other interest income	1,677	1,587	5,023	4,577
Interest on deposits	158	144	469	434
Interest on short-term borrowings	4	5	12	8
Interest on long-term debt	140	175	425	513
Total interest expense	314	351	958	1,049
Depreciation expense on operating lease assets	412	337	1,182	946
Net financing revenue (loss)	951	899	2,883	2,582
Nonbank subsidiaries	0	0	0	0
Servicing fees	(23)	45	(4)	178
Servicing asset valuation and hedge activities, net	0	134	(213)	74
Total servicing income, net	(23)	179	(217)	252
Insurance premiums and service revenue earned	251	262	768	793
Gain (loss) on mortgage and automotive loans, net	15	140	52	250
Gains (Losses) on Extinguishment of Debt	0		0
Other gain (loss) on investments, net	41	(23)	156	130
Other income, net of losses	350	305	1,116	909
Total other revenue	634	863	1,875	2,334
Total net revenue (loss)	1,585	1,762	4,758	4,916
Provision for loan losses	72	50	63	123
Compensation and benefits expense	205	83	622	262
Insurance losses and loss adjustment expenses	85	90	346	337
Other operating expenses	508	585	1,692	1,046
Total noninterest expense	798	758	2,660	1,645
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	715	954	2,035	3,148
Income tax expense (benefit) from continuing operations	217	350	694	883
Net income (loss) from continuing operations	498	604	1,341	2,265
Income (loss) from discontinued operations, net of tax	(253)	141	1,293	(655)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	245	745	2,634	1,610
Other comprehensive income (loss), net of tax	24	539	(830)	502
Comprehensive income (loss)	269	1,284	1,804	2,112
Consolidation, Eliminations [Member]
Condensed Income 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
Interest on trading assets				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)	(32)	(101)	(111)
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	(4)	(5)	(12)
Total interest expense	(35)	(32)	(100)	(107)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	(1)	(4)
Nonbank subsidiaries	(54)	(99)	(8,876)	(419)
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
Gains (Losses) on Extinguishment of Debt	0		0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(308)	(304)	(920)	(904)
Total other revenue	(308)	(304)	(920)	(904)
Total net revenue (loss)	(362)	(403)	(9,797)	(1,327)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(113)	(122)	(345)	(376)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(195)	(183)	(575)	(529)
Total noninterest expense	(308)	(305)	(920)	(905)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(54)	(98)	(8,877)	(422)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(54)	(98)	(8,877)	(422)
Income (loss) from discontinued operations, net of tax	0	0	1	(2)
Undistributed income of bank subsidiaries	(470)	(462)	(1,336)	(1,458)
Undistributed income of nonbank subsidiaries	24	(476)	5,665	(722)
Net income (loss)	(500)	(1,036)	(4,547)	(2,604)
Other comprehensive income (loss), net of tax	10	(780)	1,583	(714)
Comprehensive income (loss)	(490)	(1,816)	(2,964)	(3,318)
Intercompany [Member]
Condensed Income 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
Intercompany [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	12	23	49	80
Interest-bearing cash	0	0	0	0
Interest Expense, Debt	23	1	43	0
Intercompany [Member] | Guarantor Subsidiaries [Member]
Condensed Income 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	1
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	21	4	46	17
Interest-bearing cash	2	5	6	14
Interest Expense, Debt	12	27	52	94
Intercompany [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(33)	(27)	(95)	(97)
Interest-bearing cash	(2)	(5)	(6)	(14)
Interest Expense, Debt	$ (35)	$ (28)	$ (95)	$ (95)