Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,118	$ 1,124	$ 2,192	$ 2,231
Interest on loans held-for-sale	14	1	38	1
Interest and dividends on available-for-sale investment securities	93	93	181	188
Interest-bearing cash	2	1	4	4
Operating leases	860	884	1,756	1,754
Total financing revenue and other interest income	2,087	2,103	4,171	4,178
Interest on deposits	177	166	349	329
Interest on short-term borrowings	12	13	23	28
Interest on long-term debt	419	549	848	1,083
Interest Expense, Debt	0	0	0	0
Total interest expense	608	728	1,220	1,440
Depreciation expense on operating lease assets	563	509	1,185	1,051
Net financing revenue (loss)	916	866	1,766	1,687
Bank Subsidiary	0	0	0	0
Nonbank subsidiaries	0	0	0	0
Servicing fees	10	7	20	16
Insurance premiums and service revenue earned	237	249	470	490
Gain (loss) on mortgage and automotive loans, net	1	6	47	6
Gains (Losses) on Extinguishment of Debt	(156)	(7)	(354)	(46)
Other gain (loss) on investments, net	45	41	100	84
Other income, net of losses	74	69	171	136
Total other revenue	211	365	454	686
Total net revenue (loss)	1,127	1,231	2,220	2,373
Provision for loan losses	140	63	256	200
Compensation and benefits expense	236	215	491	469
Insurance losses and loss adjustment expenses	122	188	178	256
Other operating expenses	366	418	750	809
Total noninterest expense	724	821	1,419	1,534
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	263	347	545	639
Income tax expense (benefit) from continuing operations	94	64	197	158
Net income (loss) from continuing operations	169	283	348	481
Income (loss) from discontinued operations, net of tax	13	40	410	69
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	182	323	758	550
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(148)	89	(117)	181
Comprehensive income (loss)	34	412	641	731
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(16)	(9)	(12)	(18)
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	1
Operating leases	0	177	0	268
Total financing revenue and other interest income	(13)	174	1	267
Interest on deposits	2	4	5	8
Interest on short-term borrowings	10	11	20	22
Interest on long-term debt	292	405	584	793
Interest Expense, Debt	6	24	25	46
Total interest expense	310	444	634	869
Depreciation expense on operating lease assets	0	103	0	168
Net financing revenue (loss)	(323)	(373)	(633)	(770)
Bank Subsidiary	400	1,500	525	1,500
Nonbank subsidiaries	248	200	486	321
Servicing fees	278	7	557	16
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	0	(8)	0
Gains (Losses) on Extinguishment of Debt	(156)	(7)	(353)	(46)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	49	199	121	385
Total other revenue	171	199	317	355
Total net revenue (loss)	496	1,526	695	1,406
Provision for loan losses	(36)	29	64	77
Compensation and benefits expense	139	134	293	288
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	310	220	620	396
Total noninterest expense	449	354	913	684
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	83	1,143	(282)	645
Income tax expense (benefit) from continuing operations	(87)	(127)	(202)	(241)
Net income (loss) from continuing operations	170	1,270	(80)	886
Income (loss) from discontinued operations, net of tax	(15)	16	372	45
Undistributed income of bank subsidiaries	(132)	(1,191)	48	(952)
Undistributed income of nonbank subsidiaries	159	228	418	571
Net income (loss)	182	323	758	550
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(148)	89	(117)	181
Comprehensive income (loss)	34	412	641	731
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
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	400	1,500	525	1,500
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	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)	400	1,500	525	1,500
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	400	1,500	525	1,500
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	400	1,500	525	1,500
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	(132)	(1,191)	48	(952)
Undistributed income of nonbank subsidiaries	0	(1)	0	0
Net income (loss)	268	308	573	548
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(67)	50	(25)	119
Comprehensive income (loss)	201	358	548	667
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,134	1,133	2,204	2,249
Interest on loans held-for-sale	14	1	38	1
Interest and dividends on available-for-sale investment securities	93	93	181	188
Interest-bearing cash	1	0	3	3
Operating leases	860	707	1,756	1,486
Total financing revenue and other interest income	2,109	1,958	4,207	3,973
Interest on deposits	175	162	344	321
Interest on short-term borrowings	2	2	3	6
Interest on long-term debt	127	144	264	290
Interest Expense, Debt	3	5	12	16
Total interest expense	307	313	623	633
Depreciation expense on operating lease assets	563	406	1,185	883
Net financing revenue (loss)	1,239	1,239	2,399	2,457
Bank Subsidiary	0	0	0	0
Nonbank subsidiaries	0	0	0	0
Servicing fees	207	0	411	0
Insurance premiums and service revenue earned	237	249	470	490
Gain (loss) on mortgage and automotive loans, net	1	6	55	6
Gains (Losses) on Extinguishment of Debt	0	0	(1)	0
Other gain (loss) on investments, net	45	41	100	84
Other income, net of losses	127	298	279	634
Total other revenue	617	594	1,314	1,214
Total net revenue (loss)	1,856	1,833	3,713	3,671
Provision for loan losses	176	34	192	123
Compensation and benefits expense	197	179	422	405
Insurance losses and loss adjustment expenses	122	188	178	256
Other operating expenses	533	528	1,083	1,072
Total noninterest expense	852	895	1,683	1,733
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	828	904	1,838	1,815
Income tax expense (benefit) from continuing operations	181	191	399	399
Net income (loss) from continuing operations	647	713	1,439	1,416
Income (loss) from discontinued operations, net of tax	28	24	38	24
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	675	737	1,477	1,440
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(166)	88	(119)	174
Comprehensive income (loss)	509	825	1,358	1,614
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	0
Total financing revenue and other interest income	(9)	(29)	(37)	(62)
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	(9)	(29)	(37)	(62)
Total interest expense	(9)	(29)	(37)	(62)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	0
Bank Subsidiary	(800)	(3,000)	(1,050)	(3,000)
Nonbank subsidiaries	(248)	(200)	(486)	(321)
Servicing fees	(475)	0	(948)	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	0	0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(102)	(428)	(229)	(883)
Total other revenue	(577)	(428)	(1,177)	(883)
Total net revenue (loss)	(1,625)	(3,628)	(2,713)	(4,204)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(100)	(98)	(224)	(224)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(477)	(330)	(953)	(659)
Total noninterest expense	(577)	(428)	(1,177)	(883)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(1,048)	(3,200)	(1,536)	(3,321)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(1,048)	(3,200)	(1,536)	(3,321)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	264	2,382	(96)	1,904
Undistributed income of nonbank subsidiaries	(159)	(227)	(418)	(571)
Net income (loss)	(943)	(1,045)	(2,050)	(1,988)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	233	(138)	144	(293)
Comprehensive income (loss)	(710)	(1,183)	(1,906)	(2,281)
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	2	5	12	16
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	5	22	21	43
Interest-bearing cash	2	2	4	3
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(7)	(27)	(33)	(59)
Interest-bearing cash	$ (2)	$ (2)	$ (4)	$ (3)