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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