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Pensions and other benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
CAD ($)
Pensions  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2024 $ 668
2025 663
2026 662
2027 661
2028 663
2029-2033 3,265
Other benefits  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2024 37
2025 35
2026 34
2027 33
2028 38
2029-2033 $ 159