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Accounting for Suspended Exploratory Wells - Aging of Costs on a Well and Project Basis (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Project
Well
Dec. 31, 2022
USD ($)
Project
Dec. 31, 2021
USD ($)
Project
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,570 $ 1,554 $ 2,044
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 71    
Number of projects (in projects) | Project 13 12 15
2000-2009      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 263    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 14    
2010-2014      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,121    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 49    
2015-2022      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 186    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 8    
2008-2012      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 292    
Number of projects (in projects) | Project 2    
2013-2016      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,082    
Number of projects (in projects) | Project 6    
2017-2023      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 196    
Number of projects (in projects) | Project 5