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Pensions and Other Benefits - Summary of Estimated Future Pension and Other Post-retirement Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
Pension Plan, Defined Benefit  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2020 $ 620
2021 623
2022 627
2023 630
2024 633
2025 – 2029 3,203
Other Post-retirement Benefit Plans  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2020 34
2021 32
2022 31
2023 30
2024 30
2025 – 2029 $ 144