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Employee Future Benefits - Schedule of Level 3 Changes in Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Balance, beginning of year $ 3,743  
Balance, end of year 4,119 $ 3,743
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Balance, beginning of year 291 282
Return on plan assets 5 (9)
Foreign currency translation 3 (1)
Purchases, sales and settlements 1 19
Balance, end of year $ 300 $ 291