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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Commercial paper $ 0 $ 626
Net (discount) premium on debentures and notes (30) (28)
Debt issuance costs (44) (57)
Total debt 10,154 13,032
Less amount classified as short-term debt [1]   976
Total long-term debt $ 10,154 12,056
Floating Rate Due December 15, 2016 [Member]    
Debt Instrument [Line Items]    
Short-term debt   350
Debt, maturity date Dec. 15, 2016  
8.25% Due July 1, 2018 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2],[3] $ 20 $ 125
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]    
Long-term debt, gross [3] $ 95 $ 750
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]    
Long-term debt, gross [3] $ 162 $ 700
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 [3] $ 485 $ 850
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 [2],[3] $ 73 $ 150
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 [3],[4] $ 1,059 $ 1,250
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 [3] $ 789 $ 1,000
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%
Devon [Member]    
Debt Instrument [Line Items]    
Total debt $ 6,859 $ 9,966
EnLink [Member]    
Debt Instrument [Line Items]    
Credit facilities 148 414
Net (discount) premium on debentures and notes 9 13
Debt issuance costs (25) (24)
Total debt 3,295 3,066
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%
EnLink [Member] | 7.125% due June 1, 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 163 $ 163
Debt, maturity date Jun. 01, 2022  
Debt interest rate, stated percentage 7.125% 7.125%
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%
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%
EnLink [Member] | 4.85% due July 15, 2026 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 500  
Debt, maturity date Jul. 15, 2026  
Debt interest rate, stated percentage 4.85%  
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%
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%
[1] 2015 short-term debt consists of commercial paper balances and floating rate debt that was retired upon maturity in December 2016.
[2] 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.
[3] These senior notes were included in 2016 tender offer redemptions discussed below.
[4] 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.