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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, 2024
CAD ($)
Defined benefit pension plans  
Expected employer contributions  
Expected employer contributions, 2025 $ 41
Expected benefit payments  
Expected benefit payments, 2025 175
Expected benefit payments, 2026 179
Expected benefit payments, 2027 182
Expected benefit payments, 2028 184
Expected benefit payments, 2029 186
Expected benefit payments, 2030 - 2034 950
Non-pension Benefit Plans  
Expected employer contributions  
Expected employer contributions, 2025 21
Expected benefit payments  
Expected benefit payments, 2025 23
Expected benefit payments, 2026 23
Expected benefit payments, 2027 23
Expected benefit payments, 2028 23
Expected benefit payments, 2029 22
Expected benefit payments, 2030 - 2034 $ 103