Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement Of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,691	$ 1,675	$ 3,369	$ 3,296
Interest on loans held-for-sale	36	86	109	170
Interest on trading facilities	2	3	13	6
Interest and dividends on available-for-sale investment securities	86	106	170	209
Interest-bearing cash	18	15	32	27
Operating leases	579	598	1,119	1,253
Total financing revenue and other interest income	2,412	2,483	4,812	4,961
Interest on deposits	184	171	370	337
Interest on short-term borrowings	60	87	135	179
Interest on long-term debt	1,068	1,331	2,245	2,737
Total interest expense	1,312	1,589	2,750	3,253
Depreciation expense on operating lease assets	318	176	611	446
Net financing revenue (loss)	782	718	1,451	1,262
Nonbank subsidiaries	0	0	0	0
Servicing fees	216	341	526	698
Servicing asset valuation and hedge activities, net	(73)	(105)	(64)	(192)
Total servicing income, net	143	236	462	506
Insurance premiums and service revenue earned	359	399	734	798
Gain (loss) on mortgage and automotive loans, net	134	116	260	206
Gain (loss) on extinguishment of debt	0	(25)	0	(64)
Other gain (loss) on investments, net	66	92	156	176
Other income, net of losses	226	239	503	443
Total other revenue	928	1,057	2,115	2,065
Total net revenue (loss)	1,710	1,775	3,566	3,327
Provision for loan losses	29	50	169	163
Compensation and benefits expense	389	415	864	839
Insurance losses and loss adjustment expenses	208	227	367	397
Other operating expenses	1,933	892	2,649	1,638
Total noninterest expense	2,530	1,534	3,880	2,874
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(849)	191	(483)	290
Income tax expense (benefit) from continuing operations	15	83	79	13
Net income (loss) from continuing operations	(864)	108	(562)	277
Income (loss) from discontinued operations, net of tax	(34)	5	(26)	(18)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	(898)	113	(588)	259
Other comprehensive income (loss), net of tax	(206)	89	(19)	64
Comprehensive income (loss)	(1,104)	202	(607)	323
Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest and dividends on available-for-sale investment securities		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	198	269	451	521
Interest on loans held-for-sale	6	0	11	0
Interest on trading facilities	0	0	0	0
Interest and dividends on available-for-sale investment securities	0	0	0	3
Interest-bearing cash	6	1	7	4
Operating leases	35	307	87	615
Total financing revenue and other interest income	277	660	629	1,317
Interest on deposits	16	16	33	31
Interest on short-term borrowings	17	13	33	26
Interest on long-term debt	677	915	1,403	1,903
Total interest expense	710	940	1,468	1,952
Depreciation expense on operating lease assets	18	69	31	200
Net financing revenue (loss)	(451)	(349)	(870)	(835)
Nonbank subsidiaries	179	10	320	511
Servicing fees	50	59	102	139
Servicing asset valuation and hedge activities, net	0	0	0	0
Total servicing income, net	50	59	102	139
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	(3)	20	(4)	20
Gain (loss) on extinguishment of debt		(25)		(64)
Other gain (loss) on investments, net	0	0	0	9
Other income, net of losses	86	(60)	145	(45)
Total other revenue	133	(6)	243	59
Total net revenue (loss)	(139)	(345)	(307)	(265)
Provision for loan losses	(22)	(44)	53	78
Compensation and benefits expense	184	192	400	390
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	818	117	911	235
Total noninterest expense	1,002	309	1,311	625
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(1,119)	(610)	(1,671)	(968)
Income tax expense (benefit) from continuing operations	(267)	(141)	(521)	(289)
Net income (loss) from continuing operations	(852)	(469)	(1,150)	(679)
Income (loss) from discontinued operations, net of tax	10	(5)	17	(10)
Undistributed income of bank subsidiaries	275	245	498	496
Undistributed income of nonbank subsidiaries	(331)	342	47	452
Net income (loss)	(898)	113	(588)	259
Other comprehensive income (loss), net of tax	(206)	89	(19)	64
Comprehensive income (loss)	(1,104)	202	(607)	323
Parent [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	32	83	73	174
Interest and dividends on available-for-sale investment securities		0
Interest-bearing cash	0		0
Interest Expense, Debt	0	(4)	(1)	(8)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	7	7	15	14
Interest on loans held-for-sale	0	0	0	0
Interest on trading facilities	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	10	13	23	25
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	1	1	1
Interest on long-term debt	3	3	5	5
Total interest expense	7	10	17	19
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	3	3	6	6
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		0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	110	1	255	1
Total other revenue	110	1	255	1
Total net revenue (loss)	113	4	266	7
Provision for loan losses	(2)	1	0	0
Compensation and benefits expense	112	3	259	5
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	1	1	2
Total noninterest expense	112	4	260	7
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	3	(1)	6	0
Income tax expense (benefit) from continuing operations	0	5	0	5
Net income (loss) from continuing operations	3	(6)	6	(5)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	275	245	498	496
Undistributed income of nonbank subsidiaries	114	116	199	313
Net income (loss)	392	355	703	804
Other comprehensive income (loss), net of tax	(155)	59	(29)	171
Comprehensive income (loss)	237	414	674	975
Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	3	6	8	11
Interest and dividends on available-for-sale investment securities		0
Interest-bearing cash	0		0
Interest Expense, Debt	4	6	11	13
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,482	1,403	2,903	2,765
Interest on loans held-for-sale	30	86	98	170
Interest on trading facilities	2	3	13	6
Interest and dividends on available-for-sale investment securities	86	106	170	206
Interest-bearing cash	12	14	25	23
Operating leases	544	291	1,032	638
Total financing revenue and other interest income	2,170	1,906	4,263	3,820
Interest on deposits	168	155	337	306
Interest on short-term borrowings	43	73	101	152
Interest on long-term debt	388	413	837	829
Total interest expense	639	735	1,367	1,483
Depreciation expense on operating lease assets	300	107	580	246
Net financing revenue (loss)	1,231	1,064	2,316	2,091
Nonbank subsidiaries	0	0	0	0
Servicing fees	166	282	424	559
Servicing asset valuation and hedge activities, net	(73)	(105)	(64)	(192)
Total servicing income, net	93	177	360	367
Insurance premiums and service revenue earned	359	399	734	798
Gain (loss) on mortgage and automotive loans, net	137	96	264	186
Gain (loss) on extinguishment of debt		0		0
Other gain (loss) on investments, net	66	92	156	167
Other income, net of losses	316	453	703	790
Total other revenue	971	1,217	2,217	2,308
Total net revenue (loss)	2,202	2,281	4,533	4,399
Provision for loan losses	53	93	116	85
Compensation and benefits expense	203	220	459	444
Insurance losses and loss adjustment expenses	208	227	367	397
Other operating expenses	1,291	929	2,083	1,704
Total noninterest expense	1,702	1,376	2,909	2,545
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	447	812	1,508	1,769
Income tax expense (benefit) from continuing operations	282	219	600	297
Net income (loss) from continuing operations	165	593	908	1,472
Income (loss) from discontinued operations, net of tax	(44)	10	(43)	(8)
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	121	603	865	1,464
Other comprehensive income (loss), net of tax	(425)	175	(37)	317
Comprehensive income (loss)	(304)	778	828	1,781
Non-Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	5	5	13	12
Interest and dividends on available-for-sale investment securities		(2)
Interest-bearing cash	9		9
Interest Expense, Debt	40	94	92	196
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	4	(4)	0	(4)
Interest on loans held-for-sale	0	0	0	0
Interest on trading facilities	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	(45)	(96)	(103)	(201)
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	(44)	(96)	(102)	(201)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	(1)	0	(1)	0
Nonbank subsidiaries	(179)	(10)	(325)	(511)
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		0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(286)	(155)	(600)	(303)
Total other revenue	(286)	(155)	(600)	(303)
Total net revenue (loss)	(466)	(165)	(926)	(814)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	(110)	0	(254)	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(176)	(155)	(346)	(303)
Total noninterest expense	(286)	(155)	(600)	(303)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(180)	(10)	(326)	(511)
Income tax expense (benefit) from continuing operations	0	0	0	0
Net income (loss) from continuing operations	(180)	(10)	(326)	(511)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	(550)	(490)	(996)	(992)
Undistributed income of nonbank subsidiaries	217	(458)	(246)	(765)
Net income (loss)	(513)	(958)	(1,568)	(2,268)
Other comprehensive income (loss), net of tax	580	(234)	66	(488)
Comprehensive income (loss)	67	(1,192)	(1,502)	(2,756)
Consolidation, Eliminations [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(40)	(94)	(94)	(197)
Interest and dividends on available-for-sale investment securities		2
Interest-bearing cash	(9)		(9)
Interest Expense, Debt	$ (44)	$ (96)	$ (102)	$ (201)