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Employee Future Benefits - Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period $ (294)    
Administration expenses (1) $ (1) $ (2)
Net asset, ending of period (240) (294)  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 381 386  
Interest on plan assets 8 12 13
Net return on plan assets 13 24  
Contributions 12 13  
Benefits paid (60) (51)  
Effect of translation on US plans   (2)  
Net asset, ending of period 353 381 386
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (175)    
Administration expenses (1) (1) (2)
Net asset, ending of period (130) (175)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 367 373  
Interest on plan assets 8 11 12
Net return on plan assets 14 25  
Contributions 5 6  
Benefits paid (54) (45)  
Effect of translation on US plans   (2)  
Net asset, ending of period 339 367 373
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (95)    
Administration expenses 0 0 0
Net asset, ending of period (87) (95)  
Supplemental Pension Plan | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 14 13  
Interest on plan assets 0 1 1
Net return on plan assets (1) (1)  
Contributions 6 6  
Benefits paid (5) (5)  
Effect of translation on US plans   0  
Net asset, ending of period 14 14 13
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (24)    
Administration expenses 0 0 0
Net asset, ending of period (23) (24)  
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  
Net asset, ending of period $ 0 $ 0 $ 0