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Transactions With Related Parties - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Aug. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Chief Executive Officer [Member]
Dec. 31, 2011
Related Party MID Member [Member]
Dec. 31, 2010
Related Party MID Member [Member]
Dec. 31, 2012
Honorary Chairman [Member]
Dec. 31, 2011
Honorary Chairman [Member]
Dec. 31, 2010
Honorary Chairman [Member]
Dec. 31, 2012
Trust for Benefit of Employees [Member]
Dec. 31, 2011
Trust for Benefit of Employees [Member]
Dec. 31, 2010
Trust for Benefit of Employees [Member]
Dec. 31, 2012
Related Party Companies Controlled By Stronach Group [Member]
Person
Dec. 31, 2011
Related Party Companies Controlled By Stronach Group [Member]
Related Party Transaction [Line Items]                              
Percentage of Company acquired   27.00%                          
Cash consideration paid $ 652 $ 75 $ 120 $ 106                      
Number of trustees and members of the class of potential beneficiaries                           3  
Related party expense           166 172 47 38 41          
Sales to companies controlled by the Stronach Group                           12 36
Services to companies controlled by the Stronach Group                           5 7
Proceeds from sale of building         43                    
Amount borrowed from company to purchase common shares maximum                     18 35 31    
Amount included in accounts receivable                     $ 17 $ 17