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Pensions and Other Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
CAD ($)
Pension Plan, Defined Benefit  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2021 $ 632
2022 629
2023 631
2024 633
2025 635
2026 – 2030 3,203
Other Post-retirement Benefit Plans  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2021 33
2022 31
2023 31
2024 30
2025 30
2026 – 2030 $ 142