Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement Of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,651	$ 1,680	$ 5,020	$ 4,976
Interest on loans held-for-sale	22	86	131	256
Interest on trading facilities	0	4	13	10
Interest and dividends on available-for-sale investment securities	73	102	243	311
Interest-bearing cash	22	14	54	41
Operating leases	639	530	1,758	1,783
Total financing revenue and other interest income	2,407	2,416	7,219	7,377
Interest on deposits	185	179	555	516
Interest on short-term borrowings	46	61	181	240
Interest on long-term debt	1,041	1,293	3,286	4,030
Total interest expense	1,272	1,533	4,022	4,786
Depreciation expense on operating lease assets	358	276	969	722
Net financing revenue (loss)	777	607	2,228	1,869
Nonbank subsidiaries	0	0	0	0
Servicing fees	91	335	617	1,033
Servicing asset valuation and hedge activities, net	134	(471)	70	(663)
Total servicing income, net	225	(136)	687	370
Insurance premiums and service revenue earned	364	390	1,098	1,188
Gain (loss) on mortgage and automotive loans, net	141	95	401	301
Gain (loss) on extinguishment of debt	0	0	0	(64)
Other gain (loss) on investments, net	(19)	75	137	251
Other income, net of losses	225	130	728	573
Total other revenue	936	554	3,051	2,619
Total net revenue (loss)	1,713	1,161	5,279	4,488
Provision for loan losses	116	50	285	213
Compensation and benefits expense	344	293	1,208	1,132
Insurance losses and loss adjustment expenses	151	170	518	567
Other operating expenses	619	754	3,268	2,392
Total noninterest expense	1,114	1,217	4,994	4,091
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	483	(106)	0	184
Income tax expense (benefit) from continuing operations	93	93	172	106
Net income (loss) from continuing operations	390	(199)	(172)	78
Income (loss) from discontinued operations, net of tax	(6)	(11)	(32)	(29)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	384	(210)	(204)	49
Other comprehensive income (loss), net of tax	218	(281)	199	(217)
Comprehensive income (loss)	602	(491)	(5)	(168)
Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest-bearing cash	0		0
Interest Expense, Debt	0	0	0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	228	297	679	818
Interest on loans held-for-sale	4	0	15	0
Interest on trading facilities		0	0	0
Interest and dividends on available-for-sale investment securities	0	0	0	3
Interest-bearing cash	7	1	14	5
Operating leases	50	48	137	663
Total financing revenue and other interest income	318	407	947	1,724
Interest on deposits	14	17	47	48
Interest on short-term borrowings	15	15	48	41
Interest on long-term debt	686	843	2,089	2,746
Total interest expense	716	871	2,184	2,823
Depreciation expense on operating lease assets	29	18	60	218
Net financing revenue (loss)	(427)	(482)	(1,297)	(1,317)
Nonbank subsidiaries	99	696	419	1,207
Servicing fees	46	69	148	208
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	46	69	148	208
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	2	0	(2)	20
Gain (loss) on extinguishment of debt				(64)
Other gain (loss) on investments, net	0	0	0	9
Other income, net of losses	70	(79)	215	(124)
Total other revenue	118	(10)	361	49
Total net revenue (loss)	(210)	204	(517)	(61)
Provision for loan losses	55	40	108	118
Compensation and benefits expense	198	95	598	485
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	105	141	1,016	376
Total noninterest expense	303	236	1,614	861
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(568)	(72)	(2,239)	(1,040)
Income tax expense (benefit) from continuing operations	(305)	(146)	(826)	(435)
Net income (loss) from continuing operations	(263)	74	(1,413)	(605)
Income (loss) from discontinued operations, net of tax	2	(2)	19	(12)
Undistributed income of bank subsidiaries	231	366	729	862
Undistributed income of nonbank subsidiaries	414	(648)	461	(196)
Net income (loss)	384	(210)	(204)	49
Other comprehensive income (loss), net of tax	218	(281)	199	(217)
Comprehensive income (loss)	602	(491)	(5)	(168)
Parent [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	29	61	102	235
Interest-bearing cash	0		0
Interest Expense, Debt	1	(4)	0	(12)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	5	7	20	21
Interest on loans held-for-sale	0	0	0	0
Interest on trading facilities		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	7	13	30	38
Interest on deposits	0	0	0	0
Interest on short-term borrowings	1	1	2	2
Interest on long-term debt	2	3	7	8
Total interest expense	6	11	23	30
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	1	2	7	8
Nonbank subsidiaries	0	0	5	0
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
Gain (loss) on extinguishment of debt				0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	120	0	375	1
Total other revenue	120	0	375	1
Total net revenue (loss)	121	2	387	9
Provision for loan losses	0	0	0	0
Compensation and benefits expense	122	3	381	8
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	1	1	2	3
Total noninterest expense	123	4	383	11
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(2)	(2)	4	(2)
Income tax expense (benefit) from continuing operations	0	(2)	0	3
Net income (loss) from continuing operations	(2)	0	4	(5)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	231	366	729	862
Undistributed income of nonbank subsidiaries	62	78	261	391
Net income (loss)	291	444	994	1,248
Other comprehensive income (loss), net of tax	241	(216)	212	(45)
Comprehensive income (loss)	532	228	1,206	1,203
Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	2	6	10	17
Interest-bearing cash	0		0
Interest Expense, Debt	3	7	14	20
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,418	1,379	4,321	4,144
Interest on loans held-for-sale	18	86	116	256
Interest on trading facilities		4	13	10
Interest and dividends on available-for-sale investment securities	73	102	243	308
Interest-bearing cash	15	13	40	36
Operating leases	589	482	1,621	1,120
Total financing revenue and other interest income	2,121	2,073	6,384	5,893
Interest on deposits	171	162	508	468
Interest on short-term borrowings	30	45	131	197
Interest on long-term debt	353	447	1,190	1,276
Total interest expense	590	728	1,957	2,211
Depreciation expense on operating lease assets	329	258	909	504
Net financing revenue (loss)	1,202	1,087	3,518	3,178
Nonbank subsidiaries	0	0	0	0
Servicing fees	45	266	469	825
Servicing asset valuation and hedge activities, net	134	(471)	70	(663)
Total servicing income, net	179	(205)	539	162
Insurance premiums and service revenue earned	364	390	1,098	1,188
Gain (loss) on mortgage and automotive loans, net	139	95	403	281
Gain (loss) on extinguishment of debt				0
Other gain (loss) on investments, net	(19)	75	137	242
Other income, net of losses	339	369	1,042	1,159
Total other revenue	1,002	724	3,219	3,032
Total net revenue (loss)	2,204	1,811	6,737	6,210
Provision for loan losses	61	10	177	95
Compensation and benefits expense	145	195	604	639
Insurance losses and loss adjustment expenses	151	170	518	567
Other operating expenses	696	771	2,779	2,475
Total noninterest expense	992	1,136	3,901	3,681
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	1,151	665	2,659	2,434
Income tax expense (benefit) from continuing operations	398	241	998	538
Net income (loss) from continuing operations	753	424	1,661	1,896
Income (loss) from discontinued operations, net of tax	(8)	(9)	(51)	(17)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	745	415	1,610	1,879
Other comprehensive income (loss), net of tax	539	(715)	502	(398)
Comprehensive income (loss)	1,284	(300)	2,112	1,481
Non-Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	4	7	17	19
Interest-bearing cash	4		13
Interest Expense, Debt	36	74	128	270
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	(3)	0	(7)
Interest on loans held-for-sale	0	0	0	0
Interest on trading facilities		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	(39)	(77)	(142)	(278)
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	(40)	(77)	(142)	(278)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	1	0	0	0
Nonbank subsidiaries	(99)	(696)	(424)	(1,207)
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
Gain (loss) on extinguishment of debt				0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(304)	(160)	(904)	(463)
Total other revenue	(304)	(160)	(904)	(463)
Total net revenue (loss)	(402)	(856)	(1,328)	(1,670)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(121)	0	(375)	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(183)	(159)	(529)	(462)
Total noninterest expense	(304)	(159)	(904)	(462)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(98)	(697)	(424)	(1,208)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(98)	(697)	(424)	(1,208)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	(462)	(732)	(1,458)	(1,724)
Undistributed income of nonbank subsidiaries	(476)	570	(722)	(195)
Net income (loss)	(1,036)	(859)	(2,604)	(3,127)
Other comprehensive income (loss), net of tax	(780)	931	(714)	443
Comprehensive income (loss)	(1,816)	72	(3,318)	(2,684)
Consolidation, Eliminations [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(35)	(74)	(129)	(271)
Interest-bearing cash	(4)		(13)
Interest Expense, Debt	$ (40)	$ (77)	$ (142)	$ (278)