Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,107	$ 1,135
Interest on loans held-for-sale	0	16
Interest and dividends on available-for-sale investment securities	95	68
Interest-bearing cash	3	3
Operating leases	870	734
Total financing revenue and other interest income	2,075	1,956
Interest on deposits	163	164
Interest on short-term borrowings	15	16
Interest on long-term debt	534	701
Total interest expense	712	881
Depreciation expense on operating lease assets	542	435
Net financing revenue (loss)	821	640
Nonbank subsidiaries	0	0
Servicing fees	9	82
Servicing asset valuation and hedge activities, net	0	(201)
Total servicing income, net	9	(119)
Insurance premiums and service revenue earned	241	259
Gain (loss) on mortgage and automotive loans, net	0	38
Gains (Losses) on Extinguishment of Debt	(39)	0
Other gain (loss) on investments, net	43	51
Other income, net of losses	67	157
Total other revenue	321	386
Total net revenue (loss)	1,142	1,026
Provision for loan losses	137	131
Compensation and benefits expense	254	285
Insurance losses and loss adjustment expenses	68	115
Other operating expenses	391	558
Total noninterest expense	713	958
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	292	(63)
Income tax expense (benefit) from continuing operations	94	(123)
Net income (loss) from continuing operations	198	60
Income (loss) from discontinued operations, net of tax	29	1,033
Undistributed income of bank subsidiaries	0	0
Undistributed income of nonbank subsidiaries	0	0
Net income (loss)	227	1,093
Other comprehensive income (loss), net of tax	92	(317)
Comprehensive income (loss)	319	776
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(9)	159
Interest on loans held-for-sale		0
Interest and dividends on available-for-sale investment securities	0	0
Interest-bearing cash	0	1
Operating leases	91	96
Total financing revenue and other interest income	93	280
Interest on deposits	4	9
Interest on short-term borrowings	11	12
Interest on long-term debt	388	560
Total interest expense	425	580
Depreciation expense on operating lease assets	65	62
Net financing revenue (loss)	(397)	(362)
Nonbank subsidiaries	121	3,299
Servicing fees	9	44
Servicing asset valuation and hedge activities, net	0	0
Total servicing income, net	9	44
Insurance premiums and service revenue earned	0	0
Gain (loss) on mortgage and automotive loans, net		0
Gains (Losses) on Extinguishment of Debt	(39)
Other gain (loss) on investments, net	0	0
Other income, net of losses	186	51
Total other revenue	156	95
Total net revenue (loss)	(120)	3,032
Provision for loan losses	48	124
Compensation and benefits expense	154	192
Insurance losses and loss adjustment expenses	0	0
Other operating expenses	176	58
Total noninterest expense	330	250
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(498)	2,658
Income tax expense (benefit) from continuing operations	(114)	(329)
Net income (loss) from continuing operations	(384)	2,987
Income (loss) from discontinued operations, net of tax	29	(265)
Undistributed income of bank subsidiaries	239	226
Undistributed income of nonbank subsidiaries	343	(1,855)
Net income (loss)	227	1,093
Other comprehensive income (loss), net of tax	92	(317)
Comprehensive income (loss)	319	776
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
Total interest expense	0	0
Depreciation expense on operating lease assets	0	0
Net financing revenue (loss)	0	0
Nonbank subsidiaries	0	3,254
Servicing fees	0	0
Servicing asset valuation and hedge activities, net	0	0
Total servicing income, net	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
Other gain (loss) on investments, net	0	0
Other income, net of losses	0	0
Total other revenue	0	0
Total net revenue (loss)	0	3,254
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	0	3,254
Income tax expense (benefit) from continuing operations	0	0
Net income (loss) from continuing operations	0	3,254
Income (loss) from discontinued operations, net of tax	0	13
Undistributed income of bank subsidiaries	239	226
Undistributed income of nonbank subsidiaries	1	(2,052)
Net income (loss)	240	1,441
Other comprehensive income (loss), net of tax	69	(578)
Comprehensive income (loss)	309	863
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,116	976
Interest on loans held-for-sale		16
Interest and dividends on available-for-sale investment securities	95	68
Interest-bearing cash	3	2
Operating leases	779	638
Total financing revenue and other interest income	2,015	1,707
Interest on deposits	159	155
Interest on short-term borrowings	4	4
Interest on long-term debt	146	146
Total interest expense	320	331
Depreciation expense on operating lease assets	477	373
Net financing revenue (loss)	1,218	1,003
Nonbank subsidiaries	0	0
Servicing fees	0	38
Servicing asset valuation and hedge activities, net	0	(201)
Total servicing income, net	0	(163)
Insurance premiums and service revenue earned	241	259
Gain (loss) on mortgage and automotive loans, net		38
Gains (Losses) on Extinguishment of Debt	0
Other gain (loss) on investments, net	43	51
Other income, net of losses	336	425
Total other revenue	620	610
Total net revenue (loss)	1,838	1,613
Provision for loan losses	89	7
Compensation and benefits expense	226	223
Insurance losses and loss adjustment expenses	68	115
Other operating expenses	544	688
Total noninterest expense	838	1,026
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	911	580
Income tax expense (benefit) from continuing operations	208	206
Net income (loss) from continuing operations	703	374
Income (loss) from discontinued operations, net of tax	0	1,284
Undistributed income of bank subsidiaries	0	0
Undistributed income of nonbank subsidiaries	0	0
Net income (loss)	703	1,658
Other comprehensive income (loss), net of tax	86	(601)
Comprehensive income (loss)	789	1,057
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	(33)	(31)
Interest on deposits	0	0
Interest on short-term borrowings	0	0
Interest on long-term debt	0	(5)
Total interest expense	(33)	(30)
Depreciation expense on operating lease assets	0	0
Net financing revenue (loss)	0	(1)
Nonbank subsidiaries	(121)	(6,553)
Servicing fees	0	0
Servicing asset valuation and hedge activities, net	0	0
Total servicing income, net	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
Other gain (loss) on investments, net	0	0
Other income, net of losses	(455)	(319)
Total other revenue	(455)	(319)
Total net revenue (loss)	(576)	(6,873)
Provision for loan losses	0	0
Compensation and benefits expense	(126)	(130)
Insurance losses and loss adjustment expenses	0	0
Other operating expenses	(329)	(188)
Total noninterest expense	(455)	(318)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(121)	(6,555)
Income tax expense (benefit) from continuing operations	0	0
Net income (loss) from continuing operations	(121)	(6,555)
Income (loss) from discontinued operations, net of tax	0	1
Undistributed income of bank subsidiaries	(478)	(452)
Undistributed income of nonbank subsidiaries	(344)	3,907
Net income (loss)	(943)	(3,099)
Other comprehensive income (loss), net of tax	(155)	1,179
Comprehensive income (loss)	(1,098)	(1,920)
Intercompany [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0
Interest-bearing cash	0	0
Interest Expense, Debt	0	0
Intercompany [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	11	24
Interest-bearing cash	0	0
Interest Expense, Debt	22	(1)
Intercompany [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
Interest Expense, Debt	0	0
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	21	5
Interest-bearing cash	1	2
Interest Expense, Debt	11	26
Intercompany [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(32)	(29)
Interest-bearing cash	(1)	(2)
Interest Expense, Debt	$ (33)	$ (25)