Goodwill (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill [Abstract]

Schedule of Goodwill [Table Text Block]

The following tables summarize the changes in the carrying amounts of Goodwill (dollars in millions):

	GMNA		GME			GMIO			GMSA			Total Automotive			GM Financial		Total
Balance at January 1, 2012	$	26,399	$	581		$	610		$	151		$	27,741		$	1,278	$	29,019
Impairment charges	—		(590		)	(105		)	—			(695		)	—		(695		)
Goodwill from business combinations (a)	—		—			61			—			61			—		61
Effect of foreign currency translation and other	—		9			19			(6		)	22			1		23
Balance at September 30, 2012	$	26,399	$	—		$	585		$	145		$	27,129		$	1,279	$	28,408
Accumulated impairment charges at December 31, 2011	$	—	$	(2,482	)	$	(270	)	$	—		$	(2,752	)	$	—	$	(2,752	)
Accumulated impairment charges at September 30, 2012	$	—	$	(3,072	)	$	(375	)	$	—		$	(3,447	)	$	—	$	(3,447	)

Goodwill Impairment Charges [Table Text Block]

The following tables summarize the Goodwill impairment charges recorded in the three and nine months ended September 30, 2012 and 2011 (dollars in millions):

	2012
	GMNA		GME		GMIO		GMSA		Total Automotive		GM Financial		Total
Three months ended September 30	$	—	$	—	$	78	$	—	$	78	$	—	$	78
Nine months ended September 30	$	—	$	590	$	105	$	—	$	695	$	—	$	695

	2011
	GMNA		GME		GMIO		GMSA		Total Automotive		GM Financial		Total
Effect of Adoption of ASU 2010-28(a)	$	—	$	1,466	$	—	$	—	$	1,466	$	—	$	1,466
Three months ended September 30	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Nine months ended September 30	$	—	$	395	$	—	$	—	$	395	$	—	$	395

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(a) Impairment charges were recorded as a cumulative-effect adjustment to beginning Retained earnings upon the adoption of ASU 2010-28 in the three months ended March 31, 2011.

Goodwill balances and key assumptions [Table Text Block]

The following table summarizes the Goodwill balances and key assumptions, which are unobservable, utilized for each of our reporting units that required a Step 2 analysis (dollars and industry volumes in millions):

							Industry Volumes(a)(b)		Market Share(a)(b)
	Goodwill(c)		WACC		Long-Term Growth Rates		2011/2012	2015/2016	2011/2012		2015/2016
GME - At January 1, 2011	$	3,053	17.0	%	0.5	%	18.4	22.0	6.6	%	7.4	%
GME - At March 31, 2011	$	1,661	16.5	%	0.5	%	18.4	22.0	6.6	%	7.4	%
GME - At March 31, 2012	$	594	17.5	%	0.5	%	19.1	21.9	6.2	%	6.3	%
GM Korea - At March 31, 2012	$	564	14.8	%	3.0	%	81.0	97.1	1.4	%	1.1	%
GM Korea - At June 30, 2012	$	523	14.8	%	3.0	%	81.0	97.1	1.4	%	1.1	%
GM Korea - At September 30, 2012	$	540	14.5	%	3.0	%	82.1	99.8	1.2	%	1.2	%

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(a) Industry forecast volumes and market share for GM Korea are based on global industry volumes because GM Korea exports vehicles globally.

(b) GME forecast volumes at January 1, 2011 and March 31, 2011 are 2011 through 2015 and GME forecast volumes at March 31, 2012 are 2012 through 2016. GM Korea forecast volumes at March 31, 2012 and June 30, 2012 are 2012 through 2015, and GM Korea forecast volumes at September 30, 2012 are 2012 through 2016.

(c) Represents the balance of Goodwill evaluated for impairment under the Step 2 analysis.