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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,124	$ 1,139	$ 2,231	$ 2,274
Interest on loans held-for-sale	1	3	1	19
Interest and dividends on available-for-sale investment securities	93	76	188	144
Interest-bearing cash	1	2	4	5
Operating leases	884	788	1,754	1,522
Total financing revenue and other interest income	2,103	2,008	4,178	3,964
Interest on deposits	166	162	329	326
Interest on short-term borrowings	13	16	28	32
Interest on long-term debt	549	703	1,083	1,404
Total interest expense	728	881	1,440	1,762
Depreciation expense on operating lease assets	509	499	1,051	934
Net financing revenue (loss)	866	628	1,687	1,268
Bank Subsidiary	0		0
Nonbank subsidiaries	0	0	0	0
Servicing fees	7	19	16	101
Servicing asset valuation and hedge activities, net	0	(12)	0	(213)
Total servicing income, net	7	7	16	(112)
Insurance premiums and service revenue earned	249	258	490	517
Gain (loss) on mortgage and automotive loans, net	6	(1)	6	37
Gains (Losses) on Extinguishment of Debt	(7)	0	(46)	0
Other gain (loss) on investments, net	41	64	84	115
Other income, net of losses	69	74	136	231
Total other revenue	365	402	686	788
Total net revenue (loss)	1,231	1,030	2,373	2,056
Provision for loan losses	63	89	200	220
Compensation and benefits expense	215	252	469	537
Insurance losses and loss adjustment expenses	188	146	256	261
Other operating expenses	418	403	809	961
Total noninterest expense	821	801	1,534	1,759
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	347	140	639	77
Income tax expense (benefit) from continuing operations	64	40	158	(83)
Net income (loss) from continuing operations	283	100	481	160
Income (loss) from discontinued operations, net of tax	40	(1,027)	69	6
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	323	(927)	550	166
Other comprehensive income (loss), net of tax	89	(181)	181	(498)
Comprehensive income (loss)	412	(1,108)	731	(332)
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(9)	272	(18)	431
Interest on loans held-for-sale	0	0	0	0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	1	1	1	2
Operating leases	177	118	268	214
Total financing revenue and other interest income	174	404	267	684
Interest on deposits	4	6	8	15
Interest on short-term borrowings	11	12	22	24
Interest on long-term debt	405	564	793	1,124
Total interest expense	444	603	869	1,183
Depreciation expense on operating lease assets	103	102	168	164
Net financing revenue (loss)	(373)	(301)	(770)	(663)
Bank Subsidiary	1,500		1,500
Nonbank subsidiaries	200	1,864	321	5,163
Servicing fees	7	38	16	82
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	7	38	16	82
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	(7)		(46)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	199	26	385	77
Total other revenue	199	64	355	159
Total net revenue (loss)	1,526	1,627	1,406	4,659
Provision for loan losses	29	105	77	229
Compensation and benefits expense	134	160	288	352
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	220	97	396	155
Total noninterest expense	354	257	684	507
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	1,143	1,265	645	3,923
Income tax expense (benefit) from continuing operations	(127)	(230)	(241)	(559)
Net income (loss) from continuing operations	1,270	1,495	886	4,482
Income (loss) from discontinued operations, net of tax	16	(1,242)	45	(1,507)
Undistributed income of bank subsidiaries	(1,191)	207	(952)	433
Undistributed income of nonbank subsidiaries	228	(1,387)	571	(3,242)
Net income (loss)	323	(927)	550	166
Other comprehensive income (loss), net of tax	89	(181)	181	(498)
Comprehensive income (loss)	412	(1,108)	731	(332)
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	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	0
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	0
Bank Subsidiary	1,500		1,500
Nonbank subsidiaries	0	405	0	3,659
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	0	0	0
Total other revenue	0	0	0	0
Total net revenue (loss)	1,500	405	1,500	3,659
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	0	0	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	0	0	0
Total noninterest expense	0	0	0	0
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	1,500	405	1,500	3,659
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	1,500	405	1,500	3,659
Income (loss) from discontinued operations, net of tax	0	(47)	0	(34)
Undistributed income of bank subsidiaries	(1,191)	207	(952)	433
Undistributed income of nonbank subsidiaries	(1)	(348)	0	(2,400)
Net income (loss)	308	217	548	1,658
Other comprehensive income (loss), net of tax	50	(141)	119	(719)
Comprehensive income (loss)	358	76	667	939
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,133	867	2,249	1,843
Interest on loans held-for-sale	1	3	1	19
Interest and dividends on available-for-sale investment securities	93	76	188	144
Interest-bearing cash	0	1	3	3
Operating leases	707	670	1,486	1,308
Total financing revenue and other interest income	1,958	1,639	3,973	3,346
Interest on deposits	162	156	321	311
Interest on short-term borrowings	2	4	6	8
Interest on long-term debt	144	139	290	285
Total interest expense	313	313	633	644
Depreciation expense on operating lease assets	406	397	883	770
Net financing revenue (loss)	1,239	929	2,457	1,932
Bank Subsidiary	0		0
Nonbank subsidiaries	0	0	0	0
Servicing fees	0	(19)	0	19
Servicing asset valuation and hedge activities, net	0	(12)	0	(213)
Total servicing income, net	0	(31)	0	(194)
Insurance premiums and service revenue earned	249	258	490	517
Gain (loss) on mortgage and automotive loans, net	6	(1)	6	37
Gains (Losses) on Extinguishment of Debt	0		0
Other gain (loss) on investments, net	41	64	84	115
Other income, net of losses	298	341	634	766
Total other revenue	594	631	1,214	1,241
Total net revenue (loss)	1,833	1,560	3,671	3,173
Provision for loan losses	34	(16)	123	(9)
Compensation and benefits expense	179	194	405	417
Insurance losses and loss adjustment expenses	188	146	256	261
Other operating expenses	528	498	1,072	1,186
Total noninterest expense	895	838	1,733	1,864
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	904	738	1,815	1,318
Income tax expense (benefit) from continuing operations	191	270	399	476
Net income (loss) from continuing operations	713	468	1,416	842
Income (loss) from discontinued operations, net of tax	24	262	24	1,546
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	737	730	1,440	2,388
Other comprehensive income (loss), net of tax	88	(253)	174	(854)
Comprehensive income (loss)	825	477	1,614	1,534
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	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
Total financing revenue and other interest income	(29)	(35)	(62)	(66)
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	(5)
Total interest expense	(29)	(35)	(62)	(65)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	(1)
Bank Subsidiary	(3,000)		(3,000)
Nonbank subsidiaries	(200)	(2,269)	(321)	(8,822)
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	(428)	(293)	(883)	(612)
Total other revenue	(428)	(293)	(883)	(612)
Total net revenue (loss)	(3,628)	(2,562)	(4,204)	(9,435)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(98)	(102)	(224)	(232)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(330)	(192)	(659)	(380)
Total noninterest expense	(428)	(294)	(883)	(612)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(3,200)	(2,268)	(3,321)	(8,823)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(3,200)	(2,268)	(3,321)	(8,823)
Income (loss) from discontinued operations, net of tax	0	0	0	1
Undistributed income of bank subsidiaries	2,382	(414)	1,904	(866)
Undistributed income of nonbank subsidiaries	(227)	1,735	(571)	5,642
Net income (loss)	(1,045)	(947)	(1,988)	(4,046)
Other comprehensive income (loss), net of tax	(138)	394	(293)	1,573
Comprehensive income (loss)	(1,183)	(553)	(2,281)	(2,473)
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	5	13	16	37
Interest-bearing cash	0	0	0	0
Interest Expense, Debt	24	21	46	20
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	0
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	22	20	43	25
Interest-bearing cash	2	2	3	4
Interest Expense, Debt	5	14	16	40
Intercompany [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(27)	(33)	(59)	(62)
Interest-bearing cash	(2)	(2)	(3)	(4)
Operating leases				0
Interest Expense, Debt	$ (29)	$ (35)	$ (62)	$ (60)