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Property, Plant and Equipment - Additional Information (Detail)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 05, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
well
Dec. 31, 2019
USD ($)
Capitalized Exploratory Well Costs [Line Items]        
Property, plant and equipment associated with sale of working interest   $ 483 $ 483 $ 0
Reclassifications to wells, facilities and equipment based on the determination of proved reserves     80  
Well costs incurred and expensed     41  
Previously capitalized well cost expensed     125  
Capitalized exploratory well costs that have been capitalized for period greater than one year   $ 329 $ 329  
Shenzi Field, Gulf of Mexico        
Capitalized Exploratory Well Costs [Line Items]        
Project interest percentage   28.00% 28.00%  
Property, plant and equipment associated with sale of working interest   $ 483 $ 483  
Asset retirement obligation associated with sale of working interest   $ 79 79  
Previously capitalized well cost expensed     $ 125  
Shenzi Field, Gulf of Mexico | Subsequent Event        
Capitalized Exploratory Well Costs [Line Items]        
Project interest percentage 28.00%      
Consideration received from sale of working interest $ 505      
Stabroek Block, Offshore Guyana        
Capitalized Exploratory Well Costs [Line Items]        
Project interest percentage   30.00% 30.00%  
Reclassifications to wells, facilities and equipment based on the determination of proved reserves   $ 80    
Capitalized well costs percentage   80.00% 80.00%  
JDA, Gulf of Thailand        
Capitalized Exploratory Well Costs [Line Items]        
Project interest percentage   50.00% 50.00%  
Capitalized well costs percentage   10.00% 10.00%  
Number of successful exploration wells drilled | well     3  
North Malay Basin, Offshore Peninsular Malaysia        
Capitalized Exploratory Well Costs [Line Items]        
Project interest percentage   50.00% 50.00%  
Capitalized well costs percentage   10.00% 10.00%  
Number of successful exploration wells drilled | well     5