XML 137 R108.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock-Based Compensation - Summary of Characteristics of Options Outstanding (Detail) - 12 months ended Dec. 31, 2015
$ in Millions
USD ($)
CAD / shares
shares
CAD / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options 7,349,416  
Remaining contractual life [years] 4 years 11 days  
Number of options exercisable 4,193,359  
Aggregate intrinsic value | $ $ 93  
Weighted average exercise price of options | CAD / shares   CAD 38.59
Weighted average exercise price | CAD / shares   CAD 25.53
Weighted average life remaining [years], exercisable 2 years 11 months 9 days  
Aggregate intrinsic value of options exercisable | $ $ 93  
Range One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range lower limit | CAD / shares $ 10  
Exercise price range upper limit | CAD / shares $ 15  
Number of options 1,000,682  
Remaining contractual life [years] 10 months 24 days  
Number of options exercisable 1,000,682  
Range Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range lower limit | CAD / shares $ 15  
Exercise price range upper limit | CAD / shares $ 20  
Number of options 20,000  
Remaining contractual life [years] 1 year 4 months 24 days  
Number of options exercisable 20,000  
Range Three [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range lower limit | CAD / shares $ 20  
Exercise price range upper limit | CAD / shares $ 25  
Number of options 1,480,560  
Remaining contractual life [years] 3 years 2 months 12 days  
Number of options exercisable 1,487,226  
Range Four [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range lower limit | CAD / shares $ 25  
Exercise price range upper limit | CAD / shares $ 30  
Number of options 1,877,018  
Remaining contractual life [years] 3 years 9 months 18 days  
Number of options exercisable 1,247,757  
Range Five [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range lower limit | CAD / shares $ 50  
Number of options 2,971,156  
Remaining contractual life [years] 5 years 8 months 12 days  
Number of options exercisable 437,694