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Supplementary Oil and Gas Information (Costs Related to Unproved Properties) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Acquisition Costs, Cumulative $ 403  
Exploration Costs, Cumulative 31  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative, Total 434 $ 764
Current Year [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Acquisition Costs, Cumulative 0  
Exploration Costs, Cumulative 6  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative, Total 6  
Prior Year [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Acquisition Costs, Cumulative 183  
Exploration Costs, Cumulative 3  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative, Total 186  
Second Prior Year [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Acquisition Costs, Cumulative 197  
Exploration Costs, Cumulative 3  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative, Total 200  
Third Prior Year and Previous [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Acquisition Costs, Cumulative 23  
Exploration Costs, Cumulative 19  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative, Total $ 42