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Lease Liabilities-Detailed Information About In Maturity Lease Payments (Detail) $ in Millions | Sep. 30, 2020 CAD ($)
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Statement [Line Items] |
Undiscounted Finance lease payments to be paid | $ 16
2020 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 1
2021 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 5
2022 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 3
2023 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 1
2024 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Thereafter [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 6
Transportation [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 6
Transportation [member] | 2020 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 1
Transportation [member] | 2021 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 3
Transportation [member] | 2022 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 2
Transportation [member] | 2023 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Transportation [member] | 2024 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Transportation [member] | Thereafter [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Vehicles [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 4
Vehicles [member] | 2020 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Vehicles [member] | 2021 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 2
Vehicles [member] | 2022 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 1
Vehicles [member] | 2023 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 1
Vehicles [member] | 2024 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Vehicles [member] | Thereafter [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 6
Surface [member] | 2020 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] | 2021 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] | 2022 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] | 2023 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] | 2024 [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | 0
Surface [member] | Thereafter [member] |
Statement [Line Items] |
Undiscounted Finance lease payments to be paid | $ 6

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