Segment And Geographic Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Financial information for our reportable operating segments is summarized as follows.

Year ended December 31, ($ in millions)	Automotive Finance operations		Insurance operations		Mortgage operations (a)			Corporate and Other (b)			Consolidated (c)
2012
Net financing revenue (loss)	$	2,827	$	64	$	151		$	(1,173	)	$	1,869
Other revenue (loss)	322		1,150		1,617			(60		)	3,029
Total net revenue (loss)	3,149		1,214		1,768			(1,233		)	4,898
Provision for loan losses	253		—		86			(10		)	329
Total noninterest expense	1,507		1,054		993			1,770			5,324
Income (loss) from continuing operations before income tax expense	$	1,389	$	160	$	689		$	(2,993	)	$	(755	)
Total assets	$	128,411	$	8,439	$	14,744		$	30,753		$	182,347
2011
Net financing revenue (loss)	$	2,530	$	62	$	210		$	(1,721	)	$	1,081
Other revenue	422		1,336		961			178			2,897
Total net revenue (loss)	2,952		1,398		1,171			(1,543		)	3,978
Provision for loan losses	89		—		150			(51		)	188
Total noninterest expense	1,530		1,082		1,643			486			4,741
Income (loss) from continuing operations before income tax expense	$	1,333	$	316	$	(622	)	$	(1,978	)	$	(951	)
Total assets	$	112,591	$	8,036	$	33,906		$	29,526		$	184,059
2010
Net financing revenue (loss)	$	2,697	$	73	$	589		$	(2,053	)	$	1,306
Other revenue (loss)	724		1,728		1,998			(34		)	4,416
Total net revenue (loss)	3,421		1,801		2,587			(2,087		)	5,722
Provision for loan losses	260		—		144			(47		)	357
Total noninterest expense	1,404		1,244		1,671			654			4,973
Income (loss) from continuing operations before income tax expense	$	1,757	$	557	$	772		$	(2,694	)	$	392
Total assets	$	97,961	$	8,789	$	36,786		$	28,472		$	172,008

(a) Represents the ResCap legal entity (prior to its deconsolidation from Ally as of May 14, 2012) and the mortgage activities of Ally Bank.

(b) Total assets for the Commercial Finance Group were $1.5 billion, $1.2 billion, and $1.6 billion at December 31, 2012, 2011 and 2010, respectively.

(c) Net financing revenue after the provision for loan losses totaled $1.5 billion, $0.9 billion, and $0.9 billion in 2012, 2011 and 2010, respectively.

Information Concerning Principal Geographic Areas [Table Text Block]

Information concerning principal geographic areas were as follows.

Year ended December 31, ($ in millions)	Revenue  (a)			Income (loss) from continuing operations before income tax expense (b)			Net income (loss) (b)			Identifiable assets (c)		Long-lived assets (d)
2012
Canada	$	236		$	51		$	295		$	13,362	$	1
Europe (e)	21			33			183			10,971		16
Latin America	2			(19		)	219			8,050		33
Asia-Pacific	4			3			99			395		—
Total foreign	263			68			796			32,778		50
Total domestic (f)	4,635			(823		)	400			149,542		13,831
Total	$	4,898		$	(755	)	$	1,196		$	182,320	$	13,881
2011
Canada	$	175		$	(16	)	$	436		$	15,156	$	282
Europe (e)	(44		)	(11		)	175			9,976		92
Latin America	(50		)	(105		)	104			7,647		30
Asia-Pacific	2			—			69			292		—
Total foreign	83			(132		)	784			33,071		404
Total domestic (f)	3,895			(819		)	(941		)	150,470		9,236
Total	$	3,978		$	(951	)	$	(157	)	$	183,541	$	9,640
2010
Canada	$	164		$	(35	)	$	402		$	17,321	$	1,522
Europe (e)	(58		)	(60		)	278			11,321		406
Latin America	9			(14		)	164			6,917		35
Asia-Pacific	4			6			7			202		—
Total foreign	119			(103		)	851			35,761		1,963
Total domestic (f)	5,603			495			178			135,722		7,541
Total	$	5,722		$	392		$	1,029		$	171,483	$	9,504

(a) Revenue consists of net financing revenue and total other revenue as presented in our Consolidated Statement of Income.

(b) The domestic amounts include original discount amortization of $349 million, $925 million, and $1.2 billion for the year endedDecember 31, 2012, 2011, and 2010, respectively.

(c) Identifiable assets consist of total assets excluding goodwill.

(d) Long-lived assets consist of investment in operating leases, net, and net property and equipment.

(e) Amounts include eliminations between our foreign operations.

(f) Amounts include eliminations between our domestic and foreign operations.