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Employee Future Benefits - Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period $ (278)    
Administration expenses (1) $ (2) $ (1)
Net asset, ending of period (294) (278)  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 386 381  
Interest on plan assets 12 13 13
Net return on plan assets 24 40  
Contributions 13 11  
Benefits paid (51) (56)  
Effect of translation on US plans (2) (1)  
Net asset, ending of period 381 386 381
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (170)    
Administration expenses (1) (2) (1)
Net asset, ending of period (175) (170)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 373 368  
Interest on plan assets 11 12 13
Net return on plan assets 25 40  
Contributions 6 6  
Benefits paid (45) (50)  
Effect of translation on US plans (2) (1)  
Net asset, ending of period 367 373 368
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (86)    
Administration expenses 0 0 0
Net asset, ending of period (95) (86)  
Supplemental Pension Plan | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 13 13  
Interest on plan assets 1 1 0
Net return on plan assets (1) 0  
Contributions 6 4  
Benefits paid (5) (5)  
Effect of translation on US plans 0 0  
Net asset, ending of period 14 13 13
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (22)    
Administration expenses 0 0 0
Net asset, ending of period (24) (22)  
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 1  
Benefits paid (1) (1)  
Effect of translation on US plans 0 0  
Net asset, ending of period $ 0 $ 0 $ 0