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Pension Plans and Other Post-Retirement Benefits - Schedule of Net Benefit Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Current service cost $ 38 $ 56
Administrative expense 1 1
Net interest expense (income) 7 13
Other long-term employee benefit losses (gains) 3 (6)
Net benefit expense 49 64
Pension    
Disclosure of defined benefit plans [line items]    
Current service cost 32 49
Administrative expense 1 1
Net interest expense (income) (4) 5
Other long-term employee benefit losses (gains) 0 0
Net benefit expense 29 55
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Current service cost 6 7
Administrative expense 0 0
Net interest expense (income) 11 8
Other long-term employee benefit losses (gains) 3 (6)
Net benefit expense $ 20 $ 9