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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, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance $ 170  
Change in defined benefit obligations:    
Foreign exchange rate movement 1 $ (4)
Change in plan assets:    
Return on plan assets (excluding amounts included in net interest expense) 48 (825)
Fair value of plan assets 2,393 2,799
Defined benefit (obligation) (2,698) (2,969)
Net defined benefit liability (asset) - ending balance 305 170
Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (36)  
Change in defined benefit obligations:    
Foreign exchange rate movement 0 (1)
Change in plan assets:    
Return on plan assets (excluding amounts included in net interest expense) 48 (825)
Fair value of plan assets 2,393 2,799
Defined benefit (obligation) (2,483) (2,763)
Net defined benefit liability (asset) - ending balance 90 (36)
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 206  
Change in defined benefit obligations:    
Foreign exchange rate movement 1 (3)
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) (215) (206)
Net defined benefit liability (asset) - ending balance 215 206
Present value of defined benefit obligation    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 2,969 4,088
Change in defined benefit obligations:    
Current service cost 38 56
Interest income (cost) (132) (114)
Actuarial losses (gains) 195 (1,078)
Benefits paid (153) (208)
Divestiture (483) 0
Foreign exchange rate movement 0 (3)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 2,698 2,969
Present value of defined benefit obligation | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 2,763 3,836
Change in defined benefit obligations:    
Current service cost 32 49
Interest income (cost) (121) (106)
Actuarial losses (gains) 187 (1,027)
Benefits paid (138) (194)
Divestiture (483) 0
Foreign exchange rate movement 1 (7)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 2,483 2,763
Present value of defined benefit obligation | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 206 252
Change in defined benefit obligations:    
Current service cost 6 7
Interest income (cost) (11) (8)
Actuarial losses (gains) 8 (51)
Benefits paid (15) (14)
Divestiture 0 0
Foreign exchange rate movement (1) 4
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 215 206
Plan assets    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (2,799) (3,643)
Change in defined benefit obligations:    
Interest income (cost) 125 101
Benefits paid (153) (208)
Divestiture (510) 0
Foreign exchange rate movement 1 (10)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) (48) 825
Employer contributions 84 99
Net defined benefit liability (asset) - ending balance (2,393) (2,799)
Plan assets | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (2,799) (3,643)
Change in defined benefit obligations:    
Interest income (cost) 125 101
Benefits paid (138) (194)
Divestiture (510) 0
Foreign exchange rate movement 1 (10)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) (48) 825
Employer contributions 69 85
Net defined benefit liability (asset) - ending balance (2,393) (2,799)
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 (15) (14)
Divestiture 0 0
Foreign exchange rate movement 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 15 14
Net defined benefit liability (asset) - ending balance $ 0 $ 0