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Areas of Judgment and Estimation Uncertainty - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Disclosure of initial application of standards or interpretations [line items] |
Costs of suspending operations and remobilization of project | $ 434
Suspended capitalized costs | 103
Remaining portion | 49
Other income (expense) |
Disclosure of initial application of standards or interpretations [line items] |
Costs of suspending operations and remobilization of project | 282
Cost of sales |
Disclosure of initial application of standards or interpretations [line items] |
Costs of suspending operations and remobilization of project | 41
Social responsibility and donations |
Disclosure of initial application of standards or interpretations [line items] |
Costs of suspending operations and remobilization of project | $ 8

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