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Contingencies - Additional Information (Detail) - Elk Valley Water Quality $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2022 CAD ($) | Mar. 31, 2023 CAD ($) | Mar. 31, 2021 count
Disclosure of contingent liabilities [line items] |  |  |
Number of claims settled | count |  |  | 2
Forecast |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Receipts from insurance proceeds |  | $ 50 |
Entering into significant commitments or contingent liabilities |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Fines paid | $ 2 |  |
Environmental contributions per offence | 28 |  |
Environmental contribution | $ 60 |  |

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