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Employee Future Benefits - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
age
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
Rate
Disclosure of defined benefit plans [line items]        
Weighted average duration of defined benefit obligation 9 years 10 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)     1100.00%  
Registered | Letter of credit        
Disclosure of defined benefit plans [line items]        
Letter of credit, posted $ 96 $ 96 $ 96 $ 96
Other        
Disclosure of defined benefit plans [line items]        
Maximum age disabled and retired members eligible for benefits   65   65