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Pensions and other benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2024
CAD ($)
Pensions  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2025 $ 674
2026 665
2027 664
2028 666
2029 658
2030-2034 3,266
Other benefits  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2025 35
2026 33
2027 32
2028 36
2029 31
2030-2034 $ 151