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Segmented Information - Schedule of Aggregates External Revenues by Customer (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenue from external customers	$ 30,837	$ 28,748	$ 23,465
General Motors [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	5,704	6,202	4,731
Fiat or Chrysler Group [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	4,637	3,864	3,102
BMW [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	4,100	4,191	3,090
Ford Motor Company [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	3,848	3,549	3,371
Volkswagen [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	3,835	3,187	2,567
Daimler AG [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	3,367	2,793	2,354
Other Customers [Member]
Revenue from External Customer [Line Items]
Revenue from external customers	$ 5,346	$ 4,962	$ 4,250

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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