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Employee Benefit Plans (Expected Cash Flows for Defined Benefit Pension and Other Post-Retirement Benefit Plans) (Details)
$ in Millions
Dec. 31, 2023
CAD ($)
Defined benefit pension plans  
Expected employer contributions  
Expected employer contributions, 2024 $ 34
Expected benefit payments  
Expected benefit payments, 2024 172
Expected benefit payments, 2025 163
Expected benefit payments, 2026 166
Expected benefit payments, 2027 171
Expected benefit payments, 2028 173
Expected benefit payments, 2029 - 2033 890
Non-pension Benefit Plans  
Expected employer contributions  
Expected employer contributions, 2024 19
Expected benefit payments  
Expected benefit payments, 2024 21
Expected benefit payments, 2025 21
Expected benefit payments, 2026 21
Expected benefit payments, 2027 21
Expected benefit payments, 2028 20
Expected benefit payments, 2029 - 2033 $ 95