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Common Shares - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Aug. 31, 2010
Dec. 31, 2012
Vote
Dec. 31, 2011
Dec. 31, 2010
Nov. 10, 2012
Nov. 10, 2011
Nov. 09, 2011
Nov. 11, 2010
Preference shares included in authorized Common Shares   99,760,000            
Shares issued or outstanding   0            
Number of votes per share   1            
Number of common stock shares to be purchased under the Bid             12,000,000 8,000,000
Commencement date of Bid   November 13, 2012 November 11, 2011 November 11, 2010        
Termination date of Bid   November 12, 2013 November 10, 2012 November 10, 2011        
Number of Common Shares purchased under the Bid   427,402     3,668,430 8,000,000    
Percentage of issued and outstanding common shares   5.20% 5.10%          
Common Shares purchased for cancellation   895,032 10,747,300          
Cash paid   $ 40 $ 407 $ 23        
Cost for plan of arrangement 10              
Stronach Group [Member]
                
Equity ownership and voting interest 7.40%              
Class B Share Repurchase [Member]
                
Cash paid 300              
Number of shares repurchased 1,453,658              
Class A Subordinate Voting Share Issuance [Member]
                
Issuance of Class A Subordinate Voting Shares $ 18.0