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Property, Plant and Equipment - Additional Information (Detail)
$ in Millions
1 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
well
Jun. 30, 2020
USD ($)
Capitalized Exploratory Well Costs [Line Items]      
Proceeds from asset sales, net of cash sold   $ 297 $ 11
Capitalized exploratory well costs that have been capitalized for period greater than one year   $ 375  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Little Knife And Murphy Creek      
Capitalized Exploratory Well Costs [Line Items]      
Proceeds from asset sales, net of cash sold $ 297    
Developed and undeveloped acreage sold | a 78,700    
Stabroek Block, Offshore Guyana      
Capitalized Exploratory Well Costs [Line Items]      
Capitalized well costs percentage   85.00%  
Project interest percentage   30.00%  
JDA, Gulf of Thailand      
Capitalized Exploratory Well Costs [Line Items]      
Capitalized well costs percentage   10.00%  
Project interest percentage   50.00%  
Number of successful exploration wells drilled | well   3  
North Malay Basin, Offshore Peninsular Malaysia      
Capitalized Exploratory Well Costs [Line Items]      
Capitalized well costs percentage   5.00%  
Project interest percentage   50.00%  
Number of successful exploration wells drilled | well   1