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Segmented Information - Share of E-Car Partnership (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Total sales $ 30,837 $ 28,748 $ 23,465
E-Car [Member]
     
Segment Reporting Information [Line Items]      
Total sales 91 92 20
Total adjusted EBIT loss $ 130 $ 91 $ 89