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Employee Future Benefits (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
age
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of defined benefit plans [line items]            
Administration expenses   $ 1     $ 2 $ 1
Weighted average duration of defined benefit obligation 14 years 4 months 24 days          
Minimum            
Disclosure of defined benefit plans [line items]            
Employer contribution (as percent)       500.00%    
Maximum            
Disclosure of defined benefit plans [line items]            
Employer contribution (as percent)       1000.00%    
Registered            
Disclosure of defined benefit plans [line items]            
Administration expenses   1     2 1
Registered | Letter of credit            
Disclosure of defined benefit plans [line items]            
Letter of credit, posted $ 89 89 $ 89 $ 89    
Registered | Related parties [member]            
Disclosure of defined benefit plans [line items]            
Administration expenses   0     0  
Supplemental Pension Plan            
Disclosure of defined benefit plans [line items]            
Administration expenses   0     0 0
Other            
Disclosure of defined benefit plans [line items]            
Maximum age disabled and retired members eligible for benefits     65 65    
Administration expenses   $ 0     $ 0 $ 0