Segment And Geographic Information (Financial Information Operating Segments) (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	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 777	$ 607	$ 2,228	$ 1,869
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
Noninterest Expense	1,114	1,217	4,994	4,091
Income (loss) from continuing operations before income tax expense	483	(106)	0	184
Total assets	182,482	181,956	182,482	181,956	184,059
Net Interest Income (Loss) after Provision for Loan Losses	661	557	1,900	1,700
North American Automotive Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	856	755	2,468	2,451
Other revenue	75	126	268	349
Total net revenue (loss)	931	881	2,736	2,800
Provision for loan losses	102	25	196	126
Noninterest Expense	319	305	957	1,046
Income (loss) from continuing operations before income tax expense	510	551	1,583	1,628
Total assets	106,909	90,532	106,909	90,532
International Automotive Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	166	167	501	505
Other revenue	53	61	178	175
Total net revenue (loss)	219	228	679	680
Provision for loan losses	13	(2)	75	42
Noninterest Expense	137	141	418	449
Income (loss) from continuing operations before income tax expense	69	89	186	189
Total assets	16,211	15,314	16,211	15,314
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	22	21	65	68
Other revenue	343	426	1,199	1,347
Total net revenue (loss)	365	447	1,264	1,415
Provision for loan losses	0	0	0	0
Noninterest Expense	332	336	1,064	1,101
Income (loss) from continuing operations before income tax expense	33	111	200	314
Total assets	8,461	8,215	8,461	8,215
Mortgage Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	53	75	143	204
Other revenue	446	(99)	1,361	576
Total net revenue (loss)	499	(24)	1,504	780
Provision for loan losses	6	31	54	115
Noninterest Expense	139	354	881	1,156
Income (loss) from continuing operations before income tax expense	354	(409)	569	(491)
Total assets	17,004	35,502	17,004	35,502
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	(320)	(411)	(949)	(1,359)
Other revenue	19	40	45	172
Total net revenue (loss)	(301)	(371)	(904)	(1,187)
Provision for loan losses	(5)	(4)	(40)	(70)
Noninterest Expense	187	81	1,674	339
Income (loss) from continuing operations before income tax expense	(483)	(448)	(2,538)	(1,456)
Total assets	33,897	32,393	33,897	32,393
Commercial Finance Operations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 1,300		$ 1,300