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Employee Future Benefits - Schedule of Level 3 Changes in Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Balance, beginning of year $ 3,468  
Balance, end of year 3,743 $ 3,468
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Balance, beginning of year 282 256
Return on plan assets (9) 28
Foreign currency translation (1) 3
Purchases, sales and settlements 19 (5)
Balance, end of year $ 291 $ 282