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Segmented Information - Summary of Net Assets for Company's Reporting Segments (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of Net Assets for Company's Reporting Segments [Line Items] |  |
Segment Net Assets | $ 28,605 | $ 25,790
Cash and cash equivalents | 3,268 | 1,276
Deferred tax assets | 372 | 308
Accounts payable | 6,266 | 5,628
Accrued salaries and wages | 815 | 753
Other accrued liabilities | 2,254 | 1,800
Segment Reconciling Items [Member] | Deduct Assets Not Included in Segment Net Assets [Member] |  |
Summary of Net Assets for Company's Reporting Segments [Line Items] |  |
Segment Net Assets | 28,605 | 25,790
Cash and cash equivalents | (3,268) | (1,276)
Deferred tax assets | (372) | (308)
Long-term receivables from joint venture partners | (66) | (71)
Accounts payable | (6,266) | (5,628)
Accrued salaries and wages | (815) | (753)
Other accrued liabilities | (2,254) | (1,800)
Operating Segments [Member] |  |
Summary of Net Assets for Company's Reporting Segments [Line Items] |  |
Segment Net Assets | $ 15,564 | $ 15,954

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