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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Short-term debt [1] $ 115  
Long-term debt, gross 10,507  
Total debt 10,406 $ 10,154
Total long-term debt 10,291 10,154 [2]
8.25% Due July 1, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt $ 20  
Debt, maturity date Jul. 01, 2018  
Debt interest rate, stated percentage 8.25%  
2.25% Due December 15, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt $ 95  
Debt, maturity date Dec. 15, 2018  
Debt interest rate, stated percentage 2.25%  
Devon [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 6,933  
Net (discount) premium on debentures and notes (30) (30)
Debt issuance costs (39) (44)
Total debt 6,864 6,859
Devon [Member] | 8.25% Due July 1, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt [3],[4] $ 20  
Long-term debt, gross [3],[4]   $ 20
Debt, maturity date Jul. 01, 2018  
Debt interest rate, stated percentage 8.25% 8.25%
Devon [Member] | 2.25% Due December 15, 2018 [Member]    
Debt Instrument [Line Items]    
Short-term debt [4] $ 95  
Long-term debt, gross [4]   $ 95
Debt, maturity date Dec. 15, 2018  
Debt interest rate, stated percentage 2.25% 2.25%
Devon [Member] | 6.30% Due January 15, 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [4] $ 162 $ 162
Debt, maturity date Jan. 15, 2019  
Debt interest rate, stated percentage 6.30% 6.30%
Devon [Member] | 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%
Devon [Member] | 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%
Devon [Member] | 5.85% due December 15, 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [4] $ 485 $ 485
Debt, maturity date Dec. 15, 2025  
Debt interest rate, stated percentage 5.85% 5.85%
Devon [Member] | 7.50% due September 15, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 73 $ 73
Debt, maturity date Sep. 15, 2027  
Debt interest rate, stated percentage 7.50% 7.50%
Devon [Member] | 7.875% due September 30, 2031 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [4],[5] $ 1,059 $ 1,059
Debt, maturity date Sep. 30, 2031  
Debt interest rate, stated percentage 7.875% 7.875%
Devon [Member] | 7.95% due April 15, 2032 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [4] $ 789 $ 789
Debt, maturity date Apr. 15, 2032  
Debt interest rate, stated percentage 7.95% 7.95%
Devon [Member] | 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%
Devon [Member] | 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%
Devon [Member] | 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%
General Partner And EnLink [Member]    
Debt Instrument [Line Items]    
Credit facilities $ 74 $ 148
Long-term debt, gross 3,574  
Net (discount) premium on debentures and notes (6) 9
Debt issuance costs (26) (25)
Total debt 3,542 3,295
General Partner And EnLink [Member] | 2.70% due April 1, 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 400 $ 400
Debt, maturity date Apr. 01, 2019  
Debt interest rate, stated percentage 2.70% 2.70%
General Partner And EnLink [Member] | 7.125% due June 1, 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross   $ 163
Debt, maturity date Jun. 01, 2022  
Debt interest rate, stated percentage 7.125% 7.125%
General Partner And EnLink [Member] | 4.40% due April 1, 2024 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 550 $ 550
Debt, maturity date Apr. 01, 2024  
Debt interest rate, stated percentage 4.40% 4.40%
General Partner And EnLink [Member] | 4.15% due June 1, 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 750 $ 750
Debt, maturity date Jun. 01, 2025  
Debt interest rate, stated percentage 4.15% 4.15%
General Partner And EnLink [Member] | 4.85% due July 15, 2026 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 500 $ 500
Debt, maturity date Jul. 15, 2026  
Debt interest rate, stated percentage 4.85% 4.85%
General Partner And EnLink [Member] | 5.60% due April 1, 2044 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 350 $ 350
Debt, maturity date Apr. 01, 2044  
Debt interest rate, stated percentage 5.60% 5.60%
General Partner And EnLink [Member] | 5.05% due April 1, 2045 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 450 $ 450
Debt, maturity date Apr. 01, 2045  
Debt interest rate, stated percentage 5.05% 5.05%
General Partner And EnLink [Member] | 5.45% due June 1, 2047 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 500  
Debt, maturity date Jun. 01, 2047  
Debt interest rate, stated percentage 5.45%  
[1] 2017 short-term debt consists of $20 million of 8.25% senior notes due July 1, 2018 and $95 million of 2.25% senior notes due December 15, 2018.
[2] Prior year amounts have been recast due to change in accounting principle. See Note 2 in “Item 8. Financial Statements and Supplementary Data” of this report.
[3] These instruments were assumed by Devon in April 2003 in conjunction with the merger with Ocean Energy. The fair value and effective rates of these 8.25% notes and 7.50% notes at the time assumed was $147 million and 5.5%, respectively, and $169 million and 6.5%, respectively.These instruments are the unsecured and unsubordinated obligations of Devon OEI Operating, L.L.C. and are guaranteed by Devon Energy Production Company, L.P. Each of these entities is a wholly-owned subsidiary of Devon.
[4] These senior notes were included in 2016 tender offer redemptions discussed below.
[5] Issued in October 2001, these are unsecured and unsubordinated obligations of Devon Financing, a wholly owned finance subsidiary of Devon. These instruments are fully and unconditionally guaranteed by Devon.