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Stock-Based Compensation - Summary of Characteristics of Options Outstanding (Detail)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CAD
Dec. 31, 2013
Range One [Member]
USD ($)
Dec. 31, 2013
Range Two [Member]
USD ($)
Dec. 31, 2013
Range Three [Member]
USD ($)
Dec. 31, 2013
Range Four [Member]
USD ($)
Dec. 31, 2013
Range Five [Member]
USD ($)
Dec. 31, 2013
Range Six [Member]
USD ($)
Dec. 31, 2013
Range Six [Member]
Minimum [Member]
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price range lower limit     $ 15 $ 25 $ 35 $ 45 $ 50     
Exercise price range upper limit     $ 20 $ 30 $ 40 $ 50 $ 55   $ 55
Number of options 4,758,108 4,758,108 487,008 1,398,853 20,000 1,156,324 665,923 1,030,000  
Remaining contractual life [years] 4 years 3 months 22 days 4 years 3 months 22 days 2 years 2 months 12 days 3 years 2 months 12 days 3 years 4 months 24 days 4 years 3 months 18 days 4 years 6 years 2 months 12 days  
Number of options exercisable 2,847,109 2,847,109 487,008 1,398,853 20,000 275,325 665,923 0  
Aggregate intrinsic value $ 198                
Weighted average exercise price of options   41.82              
Weighted average life remaining [years] 3 years 4 months 17 days 3 years 4 months 17 days              
Weighted average exercise price   34.33              
Aggregate intrinsic value of options exercisable $ 139