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Pensions and other benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2022
CAD ($)
Pensions  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2023 $ 652
2024 648
2025 649
2026 648
2027 649
2028-2032 3,234
Other benefits  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2023 33
2024 31
2025 30
2026 29
2027 29
2028-2032 $ 137