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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Short-term debt [1] $ 277 $ 115
Net discount on debentures and notes (25) (30)
Debt issuance costs (34) (39)
Total debt 6,067 6,864
Total long-term debt 5,790 6,749
8.25% Due July 1, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt $ 20 $ 20
Debt, maturity date Jul. 01, 2018  
Debt interest rate, stated percentage 8.25% 8.25%
2.25% Due December 15, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt $ 95 $ 95
Debt, maturity date Dec. 15, 2018  
Debt interest rate, stated percentage 2.25% 2.25%
6.30% Due January 15, 2019 [Member]    
Debt Instrument [Line Items]    
Short-term debt $ 162  
Long-term debt, gross   $ 162
Debt, maturity date Jan. 15, 2019  
Debt interest rate, stated percentage 6.30% 6.30%
4.00% Due July 15, 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 500 $ 500
Debt, maturity date Jul. 15, 2021  
Debt interest rate, stated percentage 4.00% 4.00%
3.25% due May 15, 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,000 $ 1,000
Debt, maturity date May 15, 2022  
Debt interest rate, stated percentage 3.25% 3.25%
5.85% due December 15, 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 485 $ 485
Debt, maturity date Dec. 15, 2025  
Debt interest rate, stated percentage 5.85% 5.85%
7.50% due September 15, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 73 $ 73
Debt, maturity date Sep. 15, 2027  
Debt interest rate, stated percentage 7.50% 7.50%
7.875% due September 30, 2031 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 675 $ 1,059
Debt, maturity date Sep. 30, 2031  
Debt interest rate, stated percentage 7.875% 7.875%
7.95% due April 15, 2032 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 366 $ 789
Debt, maturity date Apr. 15, 2032  
Debt interest rate, stated percentage 7.95% 7.95%
5.60% due July 15, 2041 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,250 $ 1,250
Debt, maturity date Jul. 15, 2041  
Debt interest rate, stated percentage 5.60% 5.60%
4.75% due May 15, 2042 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 750
Debt, maturity date May 15, 2042  
Debt interest rate, stated percentage 4.75% 4.75%
5.00% due June 15, 2045 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 750
Debt, maturity date Jun. 15, 2045  
Debt interest rate, stated percentage 5.00% 5.00%
[1] Short-term debt as of June 30, 2018 consists of Devon’s $20 million of 8.25% senior notes due July 1, 2018, $95 million of 2.25% senior notes due December 15, 2018 and $162 million of 6.30% senior notes due January 15, 2019.
[2] These senior notes were included in the 2018 tender offer repurchases discussed below.