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Employee Future Benefits - Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period $ (238)    
Administration expenses (2) $ (1) $ (2)
Net asset, ending of period (278) (238)  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 381 428  
Interest on plan assets 13 13 15
Net return on plan assets 40 (25)  
Contributions 11 12  
Benefits paid (56) (48)  
Effect of translation on US plans (1) 2  
Net asset, ending of period 386 381 428
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (146)    
Administration expenses (2) (1) (2)
Net asset, ending of period (170) (146)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 368 416  
Interest on plan assets 12 13 15
Net return on plan assets 40 (25)  
Contributions 6 5  
Benefits paid (50) (42)  
Effect of translation on US plans (1) 2  
Net asset, ending of period 373 368 416
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (67)    
Administration expenses 0 0 0
Net asset, ending of period (86) (67)  
Supplemental Pension Plan | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 13 12  
Interest on plan assets 1 0 0
Net return on plan assets 0 0  
Contributions 4 6  
Benefits paid (5) (5)  
Effect of translation on US plans 0 0  
Net asset, ending of period 13 13 12
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (25)    
Administration expenses 0 0 0
Net asset, ending of period (22) (25)  
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