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Plan of Arrangement (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Aug. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Class of Stock [Line Items]        
Cash paid   $ 407 $ 23  
Plan of Arrangement (Textual) [Abstract]        
Cost for plan of arrangement 10      
Cash investment by Magna in Vehicle Electrification Partnership 145      
Gain on disposal of investment income 16 (121) (132) (112)
Class A Subordinate Voting Share Issuance [Member]
        
Class of Stock [Line Items]        
Issuance of Class A Subordinate Voting Shares 18.0      
Class B Share Repurchase [Member]
        
Class of Stock [Line Items]        
Number of shares repurchased 1.5      
Cash paid 300      
Stronach Group Investment in E-Car [Member]
        
Class of Stock [Line Items]        
Investment by Stronach group $ 80      
Equity ownership and voting interest 27.00%      
Magna International Inc [Member]
        
Class of Stock [Line Items]        
Magna equity interest in the partnership 73.00%      
Stronach Group [Member]
        
Class of Stock [Line Items]        
Equity ownership and voting interest 7.40%