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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue from External Customer [Line Items]      
Revenue from external customers $ 34,835 $ 30,837 $ 28,748
General Motors [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 6,394 5,704 6,202
Fiat or Chrysler Group [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 5,137 4,637 3,864
BMW [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 4,882 4,100 4,191
Ford Motor Company [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 4,450 3,848 3,549
Volkswagen [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 4,047 3,835 3,187
Daimler AG [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers 3,949 3,367 2,793
Other Customers [Member]
      
Revenue from External Customer [Line Items]      
Revenue from external customers $ 5,976 $ 5,346 $ 4,962