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Pension Plans and Other Post-Retirement Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance $ 305  
Change in defined benefit obligations:    
Foreign exchange rate movements (5) $ 1
Change in plan assets:    
Return on plan assets (excluding amounts included in net interest expense) (13) 48
Fair value of plan assets 2,427 2,393
Defined benefit (obligation) (2,720) (2,698)
Net defined benefit liability (asset) - ending balance 293 305
Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 90  
Change in defined benefit obligations:    
Foreign exchange rate movements 0 0
Change in plan assets:    
Return on plan assets (excluding amounts included in net interest expense) (13) 48
Fair value of plan assets 2,427 2,393
Defined benefit (obligation) (2,499) (2,483)
Net defined benefit liability (asset) - ending balance 72 90
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 215  
Change in defined benefit obligations:    
Foreign exchange rate movements (5) 1
Change in plan assets:    
Return on plan assets (excluding amounts included in net interest expense) 0 0
Fair value of plan assets 0 0
Defined benefit (obligation) (221) (215)
Net defined benefit liability (asset) - ending balance 221 215
Present value of defined benefit obligation    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 2,698 2,969
Change in defined benefit obligations:    
Current service cost 43 38
Interest income (cost) (127) (132)
Actuarial losses (gains) (39) 195
Benefits paid (148) (153)
Divestiture 0 (483)
Foreign exchange rate movements 39 0
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 2,720 2,698
Present value of defined benefit obligation | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 2,483 2,763
Change in defined benefit obligations:    
Current service cost 35 32
Interest income (cost) (116) (121)
Actuarial losses (gains) (35) 187
Benefits paid (134) (138)
Divestiture 0 (483)
Foreign exchange rate movements 34 1
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 2,499 2,483
Present value of defined benefit obligation | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 215 206
Change in defined benefit obligations:    
Current service cost 8 6
Interest income (cost) (11) (11)
Actuarial losses (gains) (4) 8
Benefits paid (14) (15)
Divestiture 0 0
Foreign exchange rate movements 5 (1)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 221 215
Plan assets    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (2,393) (2,799)
Change in defined benefit obligations:    
Interest income (cost) 114 125
Benefits paid (148) (153)
Divestiture 0 (510)
Foreign exchange rate movements 34 1
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 13 (48)
Employer contributions 48 84
Net defined benefit liability (asset) - ending balance (2,427) (2,393)
Plan assets | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (2,393) (2,799)
Change in defined benefit obligations:    
Interest income (cost) 114 125
Benefits paid (134) (138)
Divestiture 0 (510)
Foreign exchange rate movements 34 1
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 13 (48)
Employer contributions 34 69
Net defined benefit liability (asset) - ending balance (2,427) (2,393)
Plan assets | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 0 0
Change in defined benefit obligations:    
Interest income (cost) 0 0
Benefits paid (14) (15)
Divestiture 0 0
Foreign exchange rate movements 0 0
Change in plan assets:    
Administrative expense 0 0
Return on plan assets (excluding amounts included in net interest expense) 0 0
Employer contributions 14 15
Net defined benefit liability (asset) - ending balance $ 0 $ 0