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Debt And Related Expenses (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 15, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 27, 2024
USD ($)
Debt Instrument [Line Items]          
Repayments of Long-term Debt   $ 472 $ 242 $ 0  
Maturity date extension   In the first quarter of 2024, Devon exercised its option to extend the 2023 Senior Credit Facility maturity date from March 24, 2028 to March 24, 2029      
Credit Facility, Commitment Fee   $ 5      
Commercial paper   0      
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Credit Facility, borrowing capacity   3,000      
Senior Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit Facility, borrowing capacity     $ 3,000    
Outstanding credit facility borrowings   0      
Outstanding letters of credit   $ 4      
Debt-to-capitalization ratio   0.265      
Senior Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt-to-capitalization ratio   0.65      
Term Loan Credit Agreement [Member]          
Debt Instrument [Line Items]          
Outstanding credit facility borrowings         $ 1,000
Debt-to-capitalization ratio   0.265      
Aggregate Principal Amount   $ 2,000      
Interest rate on the term loan   5.81%      
Term Loan Credit Agreement [Member] | Tranche One [Member]          
Debt Instrument [Line Items]          
Aggregate Principal Amount   $ 500,000      
Term Loan Credit Agreement [Member] | Tranche Two [Member]          
Debt Instrument [Line Items]          
Aggregate Principal Amount   $ 1,500      
5.20% due 2034 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt interest rate, stated percentage   5.20%      
Issuance of Senior Long-Term Debt   $ 1,250      
5.75% due 2054 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt interest rate, stated percentage   5.75%      
Issuance of Senior Long-Term Debt   $ 1,000      
5.25% due September 15, 2024 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Repayments of Long-term Debt $ 472        
Debt interest rate, stated percentage 5.25%        
8.25% due August 1, 2023 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Repayments of Long-term Debt $ 242        
Debt interest rate, stated percentage 8.25%