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Employee Future Benefits - Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period $ (247)    
Administration expenses (1) $ (2) $ (2)
Net asset, ending of period (238) (247)  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 428 433  
Interest on plan assets 13 15 16
Net return on plan assets (25) 26  
Contributions 12 12  
Benefits paid (48) (55)  
Effect of translation on US plans 2 (1)  
Net asset, ending of period 381 428 433
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (75)    
Administration expenses 0 0 0
Net asset, ending of period (67) (75)  
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 12 10  
Interest on plan assets 0 0 0
Net return on plan assets 0 0  
Contributions 6 6  
Benefits paid (5) (4)  
Effect of translation on US plans 0 0  
Net asset, ending of period 13 12 10
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (145)    
Administration expenses (1) (2) (2)
Net asset, ending of period (146) (145)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 416 423  
Interest on plan assets 13 15 16
Net return on plan assets (25) 26  
Contributions 5 6  
Benefits paid (42) (51)  
Effect of translation on US plans 2 (1)  
Net asset, ending of period 368 416 423
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (27)    
Administration expenses 0 0 0
Net asset, ending of period (25) (27)  
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 0 0  
Interest on plan assets 0 0 0
Net return on plan assets 0 0  
Contributions 1 0  
Benefits paid (1) 0  
Effect of translation on US plans 0 0  
Net asset, ending of period $ 0 $ 0 $ 0