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Debt And Related Expenses (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2025
USD ($)
Sep. 15, 2024
USD ($)
Aug. 12, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Aug. 28, 2024
USD ($)
Debt Instrument [Line Items]                
Repayments of long-term debt       $ 485 $ 472 $ 485 $ 472  
Maturity date extension           in the first quarter of 2025, Devon exercised its option to extend the Senior Credit Facility maturity date from March 24, 2029 to March 24, 2030    
Term Loan Credit Agreement [Member]                
Debt Instrument [Line Items]                
Aggregate Principal Amount     $ 2,000          
Outstanding credit facility borrowings     1,000          
Debt-to-capitalization ratio       0.249   0.249    
Interest rate on the term loan       5.80%   5.80%    
Senior Credit Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, borrowing capacity       $ 3,000   $ 3,000    
Outstanding credit facility borrowings       $ 0   $ 0    
Debt-to-capitalization ratio       0.249   0.249    
Outstanding letters of credit       $ 4   $ 4    
Senior Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt-to-capitalization ratio       0.65   0.65    
Tranche One [Member] | Term Loan Credit Agreement [Member]                
Debt Instrument [Line Items]                
Aggregate Principal Amount     500          
Tranche Two [Member] | Term Loan Credit Agreement [Member]                
Debt Instrument [Line Items]                
Aggregate Principal Amount     $ 1,500          
Senior Notes [Member] | Devon [Member]                
Debt Instrument [Line Items]                
Repayments of Related Party Debt   $ 472            
Early Repayments of Related Party Debt $ 485              
Debt interest rate, stated percentage 5.85% 5.25%            
5.2% due 2034 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Issuance of Senior Long-Term Debt               $ 1,250
Debt interest rate, stated percentage               5.20%
5.75% due 2054 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Issuance of Senior Long-Term Debt               $ 1,000
Debt interest rate, stated percentage               5.75%