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Earnings (Loss) Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Basic earnings (loss) per Common or Class B Share:      
Net income (loss) attributable to Magna International Inc. $ 1,018 $ 1,003 $ (453)
Average number of Common and Class B Shares outstanding during the year 239.3 230.0 223.6
Basic earnings (loss) per Common or Class B Share $ 4.26 $ 4.36 $ (2.03)
Diluted earnings (loss) per Common or Class B Share:      
Net income (loss) attributable to Magna International Inc. $ 1,018 $ 1,003 $ (453)
Average number of Common and Class B Shares outstanding during the year 239.3 230.0 223.6
Adjustments      
Stock options and restricted stock 3.5 3.0  
Diluted 242.8 233.0 223.6
Diluted earnings (loss) per Common or Class B Share $ 4.20 $ 4.30 $ (2.03)