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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, 2020 USD_per_LB | Dec. 31, 2019 USD_per_LB
Canada, Dollars |  |
Disclosure of information for cash-generating units [line items] |  |
Long-term foreign exchange rates | 1.30 | 1.30
WCS Heavy Oil |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 46 |
Steelmaking coal |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 150 | 150
Copper |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 3.00 | 3.00
Bottom of range |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax real discount rates | 600.00% |
Top of range |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax real discount rates | 800.00% | 540.00%

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