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Asset and Goodwill Impairment Testing - Summary of Key Assumptions Used in Our Asset Impairment Reversal and Goodwill Impairment Analyses (Detail) | 12 Months Ended
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Dec. 31, 2022 USD_per_LB | Dec. 31, 2021 USD_per_LB
Steelmaking Coal Group |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs | 10.00% | 6.00%
Quebrada Blanca |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs | 6.50% | 6.00%
Canada, Dollars |  |
Disclosure of information for cash-generating units [line items] |  |
Long-term foreign exchange rates | 1.30 | 1.28
Steelmaking coal |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 185 | 150
Copper |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 3.60 | 3.30

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