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Pensions and Other Benefits - Summary of Pension Plan Asset Allocation and Current Weighted Average Policy Range (Detail) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 100.00%  
Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Unamortized prior service cost expected to be recognized in next fiscal year CAD 7  
Other Postretirement Benefit Plan [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation Percentage 100.00% 100.00%
Unamortized prior service cost expected to be recognized in next fiscal year CAD 1  
Cash and Cash Equivalents [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 0.50%  
Cash and Cash Equivalents [Member] | Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation percentage, current policy lower range 0.00%  
Asset allocation percentage, current policy upper range 5.00%  
Asset allocation Percentage 1.10% 1.70%
Fixed Income Securities [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 29.50%  
Fixed Income Securities [Member] | Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation percentage, current policy lower range 20.00%  
Asset allocation percentage, current policy upper range 40.00%  
Asset allocation Percentage 21.00% 21.90%
Public equity [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 46.00%  
Public equity [Member] | Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation percentage, current policy lower range 35.00%  
Asset allocation percentage, current policy upper range 55.00%  
Asset allocation Percentage 54.50% 52.50%
Real estate and infrastructure [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 12.00%  
Real estate and infrastructure [Member] | Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation percentage, current policy lower range 4.00%  
Asset allocation percentage, current policy upper range 20.00%  
Asset allocation Percentage 5.80% 7.60%
Absolute Return [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Current asset allocation target 12.00%  
Absolute Return [Member] | Pension Plans, Defined Benefit [Member]    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation percentage, current policy lower range 0.00%  
Asset allocation percentage, current policy upper range 18.00%  
Asset allocation Percentage 17.60% 16.30%