Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,166	$ 1,114	$ 3,358	$ 3,345
Interest on loans held-for-sale	2	0	40	1
Interest and dividends on available-for-sale investment securities	102	94	283	282
Interest-bearing cash	2	2	6	6
Operating leases	830	899	2,586	2,653
Total financing revenue and other interest income	2,102	2,109	6,273	6,287
Interest on deposits	181	166	530	495
Interest on short-term borrowings	13	12	36	40
Interest on long-term debt	410	493	1,258	1,576
Interest Expense, Debt	0	0	0	0
Total interest expense	604	671	1,824	2,111
Depreciation expense on operating lease assets	528	549	1,713	1,600
Net financing revenue (loss)	970	889	2,736	2,576
Bank Subsidiary		0	0	0
Nonbank subsidiaries	0	0	0	0
Servicing fees	12	6	32	22
Insurance premiums and service revenue earned	236	246	706	736
Gain (loss) on mortgage and automotive loans, net	(2)	0	45	6
Gains (Losses) on Extinguishment of Debt	0	0	(354)	(46)
Other gain (loss) on investments, net	6	45	106	129
Other income, net of losses	80	78	251	214
Total other revenue	332	375	786	1,061
Total net revenue (loss)	1,302	1,264	3,522	3,637
Provision for loan losses	211	102	467	302
Compensation and benefits expense	235	241	726	710
Insurance losses and loss adjustment expenses	61	97	239	353
Other operating expenses	378	404	1,128	1,213
Total noninterest expense	674	742	2,093	2,276
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	417	420	962	1,059
Income tax expense (benefit) from continuing operations	144	127	341	285
Net income (loss) from continuing operations	273	293	621	774
Income (loss) from discontinued operations, net of tax	(5)	130	405	199
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	268	423	1,026	973
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	61	(55)	(56)	126
Comprehensive income (loss)	329	368	970	1,099
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(33)	16	(45)	(2)
Interest on loans held-for-sale	0		0	0
Interest and dividends on available-for-sale investment securities	0	0	0	0
Interest-bearing cash	0	0	1	1
Operating leases	1	1	1	269
Total financing revenue and other interest income	(29)	27	(28)	294
Interest on deposits	3	3	8	11
Interest on short-term borrowings	10	10	30	32
Interest on long-term debt	272	350	856	1,143
Interest Expense, Debt	3	22	28	68
Total interest expense	288	385	922	1,254
Depreciation expense on operating lease assets	1	(4)	1	164
Net financing revenue (loss)	(318)	(354)	(951)	(1,124)
Bank Subsidiary		150	525	1,650
Nonbank subsidiaries	494	141	980	462
Servicing fees	289	6	846	22
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	(1)	(2)	(9)	(2)
Gains (Losses) on Extinguishment of Debt			(353)	(46)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	78	206	199	591
Total other revenue	366	210	683	565
Total net revenue (loss)	542	147	1,237	1,553
Provision for loan losses	48	88	111	165
Compensation and benefits expense	138	153	431	441
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	315	252	935	648
Total noninterest expense	453	405	1,366	1,089
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	41	(346)	(240)	299
Income tax expense (benefit) from continuing operations	(30)	(68)	(231)	(309)
Net income (loss) from continuing operations	71	(278)	(9)	608
Income (loss) from discontinued operations, net of tax	(5)	127	367	172
Undistributed income of bank subsidiaries	254	150	302	(802)
Undistributed income of nonbank subsidiaries	(52)	424	366	995
Net income (loss)	268	423	1,026	973
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	61	(55)	(56)	126
Comprehensive income (loss)	329	368	970	1,099
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 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
Interest Expense, 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		150	525	1,650
Nonbank subsidiaries	0	0	0	0
Servicing fees	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)	0	150	525	1,650
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	0	150	525	1,650
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	0	150	525	1,650
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	254	150	302	(802)
Undistributed income of nonbank subsidiaries	(1)	(2)	(1)	(2)
Net income (loss)	253	298	826	846
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	65	(3)	40	116
Comprehensive income (loss)	318	295	866	962
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,199	1,098	3,403	3,347
Interest on loans held-for-sale	2		40	1
Interest and dividends on available-for-sale investment securities	102	94	283	282
Interest-bearing cash	2	2	5	5
Operating leases	829	898	2,585	2,384
Total financing revenue and other interest income	2,137	2,114	6,344	6,087
Interest on deposits	178	163	522	484
Interest on short-term borrowings	3	2	6	8
Interest on long-term debt	138	143	402	433
Interest Expense, Debt	3	10	15	26
Total interest expense	322	318	945	951
Depreciation expense on operating lease assets	527	553	1,712	1,436
Net financing revenue (loss)	1,288	1,243	3,687	3,700
Bank Subsidiary		0	0	0
Nonbank subsidiaries	0	0	0	0
Servicing fees	210	0	621	0
Insurance premiums and service revenue earned	236	246	706	736
Gain (loss) on mortgage and automotive loans, net	(1)	2	54	8
Gains (Losses) on Extinguishment of Debt			(1)	0
Other gain (loss) on investments, net	6	45	106	129
Other income, net of losses	119	373	398	1,007
Total other revenue	570	666	1,884	1,880
Total net revenue (loss)	1,858	1,909	5,571	5,580
Provision for loan losses	163	14	356	137
Compensation and benefits expense	212	199	634	604
Insurance losses and loss adjustment expenses	61	97	239	353
Other operating expenses	552	542	1,635	1,614
Total noninterest expense	825	838	2,508	2,571
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	870	1,057	2,707	2,872
Income tax expense (benefit) from continuing operations	174	195	572	594
Net income (loss) from continuing operations	696	862	2,135	2,278
Income (loss) from discontinued operations, net of tax	0	3	38	27
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	696	865	2,173	2,305
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	55	(50)	(64)	124
Comprehensive income (loss)	751	815	2,109	2,429
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 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	(6)	(32)	(43)	(94)
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
Interest Expense, Debt	(6)	(32)	(43)	(94)
Total interest expense	(6)	(32)	(43)	(94)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	0
Bank Subsidiary		(300)	(1,050)	(3,300)
Nonbank subsidiaries	(494)	(141)	(980)	(462)
Servicing fees	(487)	0	(1,435)	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	(117)	(501)	(346)	(1,384)
Total other revenue	(604)	(501)	(1,781)	(1,384)
Total net revenue (loss)	(1,098)	(942)	(3,811)	(5,146)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(115)	(111)	(339)	(335)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(489)	(390)	(1,442)	(1,049)
Total noninterest expense	(604)	(501)	(1,781)	(1,384)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(494)	(441)	(2,030)	(3,762)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(494)	(441)	(2,030)	(3,762)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	(508)	(300)	(604)	1,604
Undistributed income of nonbank subsidiaries	53	(422)	(365)	(993)
Net income (loss)	(949)	(1,163)	(2,999)	(3,151)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(120)	53	24	(240)
Comprehensive income (loss)	(1,069)	(1,110)	(2,975)	(3,391)
Affiliated Entity [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
Affiliated Entity [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	3	10	15	26
Interest-bearing cash	0	0	0	0
Affiliated Entity [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
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1	21	22	64
Interest-bearing cash	2	1	6	4
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(4)	(31)	(37)	(90)
Interest-bearing cash	$ (2)	$ (1)	$ (6)	$ (4)