Segment And Geographic Information (Financial Information Operating Segments) (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	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 782	$ 718	$ 1,451	$ 1,262
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
Noninterest Expense	2,530	1,534	3,880	2,874
Income (loss) from continuing operations before income tax expense	(849)	191	(483)	290
Total assets	178,560	178,889	178,560	178,889	184,059
Net Interest Income (Loss) after Provision for Loan Losses	753	668	1,300	1,100
North American Automotive Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	837	878	1,612	1,696
Other revenue	114	114	193	223
Total net revenue (loss)	951	992	1,805	1,919
Provision for loan losses	16	55	94	101
Noninterest Expense	304	378	638	741
Income (loss) from continuing operations before income tax expense	631	559	1,073	1,077
Total assets	104,927	90,943	104,927	90,943
International Automotive Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	171	172	335	338
Other revenue	59	56	125	114
Total net revenue (loss)	230	228	460	452
Provision for loan losses	15	7	62	44
Noninterest Expense	143	152	281	308
Income (loss) from continuing operations before income tax expense	72	69	117	100
Total assets	15,467	16,582	15,467	16,582
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	23	25	43	47
Other revenue	408	458	856	921
Total net revenue (loss)	431	483	899	968
Provision for loan losses	0	0	0	0
Noninterest Expense	388	411	732	765
Income (loss) from continuing operations before income tax expense	43	72	167	203
Total assets	8,237	8,533	8,237	8,533
Mortgage Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	33	69	90	129
Other revenue	368	322	915	675
Total net revenue (loss)	401	391	1,005	804
Provision for loan losses	21	37	48	84
Noninterest Expense	356	479	742	802
Income (loss) from continuing operations before income tax expense	24	(125)	215	(82)
Total assets	17,146	31,323	17,146	31,323
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	(282)	(426)	(629)	(948)
Other revenue	(21)	107	26	132
Total net revenue (loss)	(303)	(319)	(603)	(816)
Provision for loan losses	(23)	(49)	(35)	(66)
Noninterest Expense	1,339	114	1,487	258
Income (loss) from continuing operations before income tax expense	(1,619)	(384)	(2,055)	(1,008)
Total assets	32,783	31,508	32,783	31,508
Commercial Finance Operations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 1,200	$ 1,300	$ 1,200	$ 1,300