v3.26.1
Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Net premium on debentures and notes $ 22 $ 23
Debt issuance costs (48) (48)
Total debt 11,388 8,389
Less amount classified as short-term debt 1,497 998
Long-term debt 9,891 7,391
3.90% due May 15, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 750 $ 0
Debt interest rate, stated percentage 3.90% 3.90%
Debt, maturity date May 15, 2027  
7.50% due September 15, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 73 $ 73
Debt interest rate, stated percentage 7.50% 7.50%
Debt, maturity date Sep. 15, 2027  
5.25% due October 15, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 390 $ 390
Debt interest rate, stated percentage 5.25% 5.25%
Debt, maturity date Oct. 15, 2027  
5.875% due June 15, 2028 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 325 $ 325
Debt interest rate, stated percentage 5.875% 5.875%
Debt, maturity date Jun. 15, 2028  
4.375% due March 15, 2029 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 500 $ 0
Debt interest rate, stated percentage 4.375% 4.375%
Debt, maturity date Mar. 15, 2029  
4.50% due January 15, 2030 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 585 $ 585
Debt interest rate, stated percentage 4.50% 4.50%
Debt, maturity date Jan. 15, 2030  
7.875% due September 30, 2031 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 675 $ 675
Debt interest rate, stated percentage 7.875% 7.875%
Debt, maturity date Sep. 30, 2031  
7.95% due April 15, 2032 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 366 $ 366
Debt interest rate, stated percentage 7.95% 7.95%
Debt, maturity date Apr. 15, 2032  
5.60% due March 15, 2034 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 500 $ 0
Debt interest rate, stated percentage 5.60% 5.60%
Debt, maturity date Mar. 15, 2034  
5.20% due September 15, 2034 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,250 $ 1,250
Debt interest rate, stated percentage 5.20% 5.20%
Debt, maturity date Sep. 15, 2034  
5.40% due February 15, 2035 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 750 $ 0
Debt interest rate, stated percentage 5.40% 5.40%
Debt, maturity date Feb. 15, 2035  
5.60% due July 15, 2041 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,250 $ 1,250
Debt interest rate, stated percentage 5.60% 5.60%
Debt, maturity date Jul. 15, 2041  
4.75% due May 15, 2042 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 750
Debt interest rate, stated percentage 4.75% 4.75%
Debt, maturity date May 15, 2042  
5.00% due June 15, 2045 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 750
Debt interest rate, stated percentage 5.00% 5.00%
Debt, maturity date Jun. 15, 2045  
5.75% due September 15, 2054 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,000 $ 1,000
Debt interest rate, stated percentage 5.75% 5.75%
Debt, maturity date Sep. 15, 2054  
5.90% due February 15, 2055 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 750 $ 0
Debt interest rate, stated percentage 5.90% 5.90%
Debt, maturity date Feb. 15, 2055  
Term Loan due September 25, 2026 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 1,000
Debt, maturity date Sep. 25, 2026  
[1] These instruments were assumed by Devon in May 2026 in conjunction with the Merger. Approximately $277 million and $27 million of these instruments remain the unsecured and unsubordinated obligations of Coterra and Coterra Energy Operating Co., respectively, each of which is a subsidiary of Devon.