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Segmented Information (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
External revenues generated by automotive products and services
Revenue from external customers	$ 28,748	$ 23,465	$ 16,876
Exterior and interior systems [Member]
External revenues generated by automotive products and services
Revenue from external customers	11,020	8,637	5,927
Body systems and chassis systems [Member]
External revenues generated by automotive products and services
Revenue from external customers	6,056	4,801	3,374
Powertrain systems [Member]
External revenues generated by automotive products and services
Revenue from external customers	3,667	3,064	2,114
Complete vehicle assembly [Member]
External revenues generated by automotive products and services
Revenue from external customers	2,690	2,163	1,764
Vision and electronic systems [Member]
External revenues generated by automotive products and services
Revenue from external customers	2,066	1,756	1,315
Tooling, engineering and other [Member]
External revenues generated by automotive products and services
Revenue from external customers	2,065	2,005	1,625
Closure systems [Member]
External revenues generated by automotive products and services
Revenue from external customers	$ 1,184	$ 1,039	$ 757

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- Definition

Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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