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Employee Future Benefits (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Administration expenses $ 1 $ 1 $ 2
Weighted average duration of defined benefit obligation 13 years 7 months 6 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 1 2
Registered | Letter of credit      
Disclosure of defined benefit plans [line items]      
Letter of credit, posted 97    
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 years    
Administration expenses $ 0 $ 0 $ 0