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Segmented Information - Summary of External Revenues by Automotive Products and Services (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue from external customers	$ 30,837	$ 28,748	$ 23,465
Exterior And Interior Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	11,673	11,020	8,637
Body Systems And Chassis Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	7,123	6,056	4,801
Powertrain Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	3,825	3,667	3,064
Complete Vehicle Assembly [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,561	2,690	2,163
Tooling, engineering and other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,317	2,065	2,005
Vision And Electronic Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,132	2,066	1,756
Closure Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	$ 1,206	$ 1,184	$ 1,039

X

- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

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X

- Details

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