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Stock Based Compensation (Details 1)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
USD ($)
Y
Dec. 31, 2011
CAD
Dec. 31, 2011
Range one [Member]
USD ($)
Y
Dec. 31, 2011
Range two [Member]
USD ($)
Y
Dec. 31, 2011
Range three [Member]
USD ($)
Y
Dec. 31, 2011
Range four [Member]
USD ($)
Y
Dec. 31, 2011
Range five [Member]
USD ($)
Y
Dec. 31, 2011
Range six [Member]
USD ($)
Y
Dec. 31, 2011
Range seven [Member]
USD ($)
Y
Dec. 31, 2011
Range eight [Member]
USD ($)
Y
Dec. 31, 2011
Range nine [Member]
USD ($)
Y
Summary of characteristics of options outstanding                      
Exercise price range lower limit     $ 15 $ 20 $ 25 $ 30 $ 35 $ 40 $ 45 $ 50 $ 55
Exercise price range upper limit     $ 20 $ 25 $ 30 $ 35 $ 40 $ 45 $ 50 $ 55  
Number of options 6,819,367 6,819,367 1,317,203 0 4,016,666 35,870 71,320 160,342 10,000 1,176,000 31,966
Remaining contractual life [years] 4.96 4.96 4.2 0.0 5.2 0.6 4.9 1.1 2.0 6.0 0.5
Number of options exercisable 2,018,700 2,018,700 600,536 0 716,666 35,870 71,320 160,342 10,000 392,000 31,966
Weighted average exercise price of options   31.48                  
Weighted average exercise price   31.74                  
Weighted average life remaining [years] 4.52 4.52                  
Aggregate intrinsic value $ 17                    
Aggregate intrinsic value of options exercisable $ 4