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Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
CAD ($)
Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 460
2021 460
2022 460
2023 460
2024 460
2025 - 2029 2,245
Other postretirement benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 31
2021 31
2022 32
2023 32
2024 32
2025 - 2029 $ 160