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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, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Current service cost $ 43 $ 38
Administrative expense 1 1
Net interest expense (income) 13 7
Other long-term employee benefit losses (gains) 5 3
Net benefit expense 62 49
Pension    
Disclosure of defined benefit plans [line items]    
Current service cost 35 32
Administrative expense 1 1
Net interest expense (income) 2 (4)
Other long-term employee benefit losses (gains) 0 0
Net benefit expense 38 29
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Current service cost 8 6
Administrative expense 0 0
Net interest expense (income) 11 11
Other long-term employee benefit losses (gains) 5 3
Net benefit expense $ 24 $ 20