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Net operating costs (excluding items shown separately) - Summary of net operating costs (excluding items shown separately) Footnotes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Costs [Line Items]      
Short-term lease costs $ 314 $ 327  
Payments for variable lease components 30 15  
Operating lease expenses     $ 787
Purchases of the other investors' share of production 129 291 332
Pre-tax gains on disposals of property, plant and equipment 45 49 586
Operating costs capitalised 537 469 400
Exploration and evaluation costs $ 171 $ 182 189
Kitimat      
Disclosure Of Operating Costs [Line Items]      
Pre-tax gains on disposals of property, plant and equipment     $ 549