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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, 2019 USD_per_LB | Dec. 31, 2018 USD_per_LB
Disclosure of information for cash-generating units [line items] |  |
Discount rate |  | 6.00%
Inflation rate | 2.00% | 2.00%
Canada, Dollars |  |
Disclosure of information for cash-generating units [line items] |  |
Long-term foreign exchange rate | 1.30 | 1.25
WCS Heavy Oil |  |
Disclosure of information for cash-generating units [line items] |  |
Future commodity price used in cash flow projections | 50 |
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] |  |
Discount rate | 5.40% |
Top of range |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 6.00% |

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