Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,074	$ 1,107
Interest on loans held-for-sale	24	0
Interest and dividends on available-for-sale investment securities	88	95
Interest-bearing cash	2	3
Operating leases	896	870
Total financing revenue and other interest income	2,084	2,075
Interest on deposits	172	163
Interest on short-term borrowings	11	15
Interest on long-term debt	429	534
Interest Expense, Debt	0	0
Total interest expense	612	712
Depreciation expense on operating lease assets	622	542
Net financing revenue (loss)	850	821
Bank Subsidiary	0
Nonbank subsidiaries	0	0
Servicing fees	10	9
Insurance premiums and service revenue earned	233	241
Gain (loss) on mortgage and automotive loans, net	46	0
Gains (Losses) on Extinguishment of Debt	(198)	(39)
Other gain (loss) on investments, net	55	43
Other income, net of losses	97	67
Total other revenue	243	321
Total net revenue (loss)	1,093	1,142
Provision for loan losses	116	137
Compensation and benefits expense	255	254
Insurance losses and loss adjustment expenses	56	68
Other operating expenses	384	391
Total noninterest expense	695	713
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	282	292
Income tax expense (benefit) from continuing operations	103	94
Net income (loss) from continuing operations	179	198
Income (loss) from discontinued operations, net of tax	397	29
Undistributed income of bank subsidiaries	0	0
Undistributed income of nonbank subsidiaries	0	0
Net income (loss)	576	227
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	31	92
Comprehensive income (loss)	607	319
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	4	(9)
Interest on loans held-for-sale	0
Interest and dividends on available-for-sale investment securities	0	0
Interest-bearing cash	0	0
Operating leases	0	91
Total financing revenue and other interest income	14	93
Interest on deposits	3	4
Interest on short-term borrowings	10	11
Interest on long-term debt	292	388
Interest Expense, Debt	19	22
Total interest expense	324	425
Depreciation expense on operating lease assets	0	65
Net financing revenue (loss)	(310)	(397)
Bank Subsidiary	125
Nonbank subsidiaries	238	121
Servicing fees	279	9
Insurance premiums and service revenue earned	0	0
Gain (loss) on mortgage and automotive loans, net	(8)
Gains (Losses) on Extinguishment of Debt	(197)	(39)
Other gain (loss) on investments, net	0	0
Other income, net of losses	72	186
Total other revenue	146	156
Total net revenue (loss)	199	(120)
Provision for loan losses	100	48
Compensation and benefits expense	154	154
Insurance losses and loss adjustment expenses	0	0
Other operating expenses	310	176
Total noninterest expense	464	330
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(365)	(498)
Income tax expense (benefit) from continuing operations	(115)	(114)
Net income (loss) from continuing operations	(250)	(384)
Income (loss) from discontinued operations, net of tax	387	29
Undistributed income of bank subsidiaries	180	239
Undistributed income of nonbank subsidiaries	259	343
Net income (loss)	576	227
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	31	92
Comprehensive income (loss)	607	319
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0
Interest on loans held-for-sale	0
Interest and dividends on available-for-sale investment securities	0	0
Interest-bearing cash	0	0
Operating leases	0	0
Total financing revenue and other interest income	0	0
Interest on deposits	0	0
Interest on short-term borrowings	0	0
Interest on long-term debt	0	0
Interest Expense, Debt	0	0
Total interest expense	0	0
Depreciation expense on operating lease assets	0	0
Net financing revenue (loss)	0	0
Bank Subsidiary	125
Nonbank subsidiaries	0	0
Servicing fees	0	0
Insurance premiums and service revenue earned	0	0
Gain (loss) on mortgage and automotive loans, net	0
Gains (Losses) on Extinguishment of Debt	0	0
Other gain (loss) on investments, net	0	0
Other income, net of losses	0	0
Total other revenue	0	0
Total net revenue (loss)	125	0
Provision for loan losses	0	0
Compensation and benefits expense	0	0
Insurance losses and loss adjustment expenses	0	0
Other operating expenses	0	0
Total noninterest expense	0	0
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	125	0
Income tax expense (benefit) from continuing operations	0	0
Net income (loss) from continuing operations	125	0
Income (loss) from discontinued operations, net of tax	0	0
Undistributed income of bank subsidiaries	180	239
Undistributed income of nonbank subsidiaries	0	1
Net income (loss)	305	240
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	42	69
Comprehensive income (loss)	347	309
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,070	1,116
Interest on loans held-for-sale	24
Interest and dividends on available-for-sale investment securities	88	95
Interest-bearing cash	2	3
Operating leases	896	779
Total financing revenue and other interest income	2,098	2,015
Interest on deposits	169	159
Interest on short-term borrowings	1	4
Interest on long-term debt	137	146
Interest Expense, Debt	9	11
Total interest expense	316	320
Depreciation expense on operating lease assets	622	477
Net financing revenue (loss)	1,160	1,218
Bank Subsidiary	0
Nonbank subsidiaries	0	0
Servicing fees	204	0
Insurance premiums and service revenue earned	233	241
Gain (loss) on mortgage and automotive loans, net	54
Gains (Losses) on Extinguishment of Debt	(1)	0
Other gain (loss) on investments, net	55	43
Other income, net of losses	152	336
Total other revenue	697	620
Total net revenue (loss)	1,857	1,838
Provision for loan losses	16	89
Compensation and benefits expense	225	226
Insurance losses and loss adjustment expenses	56	68
Other operating expenses	550	544
Total noninterest expense	831	838
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	1,010	911
Income tax expense (benefit) from continuing operations	218	208
Net income (loss) from continuing operations	792	703
Income (loss) from discontinued operations, net of tax	10	0
Undistributed income of bank subsidiaries	0	0
Undistributed income of nonbank subsidiaries	0	0
Net income (loss)	802	703
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	47	86
Comprehensive income (loss)	849	789
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0
Interest on loans held-for-sale	0
Interest and dividends on available-for-sale investment securities	0	0
Interest-bearing cash	0	0
Operating leases	0	0
Total financing revenue and other interest income	(28)	(33)
Interest on deposits	0	0
Interest on short-term borrowings	0	0
Interest on long-term debt	0	0
Interest Expense, Debt	(28)	(33)
Total interest expense	(28)	(33)
Depreciation expense on operating lease assets	0	0
Net financing revenue (loss)	0	0
Bank Subsidiary	(250)
Nonbank subsidiaries	(238)	(121)
Servicing fees	(473)	0
Insurance premiums and service revenue earned	0	0
Gain (loss) on mortgage and automotive loans, net	0
Gains (Losses) on Extinguishment of Debt	0	0
Other gain (loss) on investments, net	0	0
Other income, net of losses	(127)	(455)
Total other revenue	(600)	(455)
Total net revenue (loss)	(1,088)	(576)
Provision for loan losses	0	0
Compensation and benefits expense	(124)	(126)
Insurance losses and loss adjustment expenses	0	0
Other operating expenses	(476)	(329)
Total noninterest expense	(600)	(455)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(488)	(121)
Income tax expense (benefit) from continuing operations	0	0
Net income (loss) from continuing operations	(488)	(121)
Income (loss) from discontinued operations, net of tax	0	0
Undistributed income of bank subsidiaries	(360)	(478)
Undistributed income of nonbank subsidiaries	(259)	(344)
Net income (loss)	(1,107)	(943)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(89)	(155)
Comprehensive income (loss)	(1,196)	(1,098)
Affiliated Entity [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0
Interest-bearing cash	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	10	11
Interest-bearing cash	0	0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0
Interest-bearing cash	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	16	21
Interest-bearing cash	2	1
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(26)	(32)
Interest-bearing cash	$ (2)	$ (1)