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Pensions and other benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2021
CAD ($)
Pensions  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2022 $ 645
2023 637
2024 638
2025 639
2026 640
2027-2031 3,209
Other benefits  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2022 32
2023 31
2024 30
2025 29
2026 29
2027-2031 $ 136