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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 4,349 |
Net discount on debentures and notes |  | (20) | $ (20)
Debt issuance costs |  | (31) | (35)
Total long-term debt |  | 4,298 | 4,294
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 | [1] | $ 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 |  | $ 675 | $ 675
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 |  | $ 366 | $ 366
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] | This instrument was assumed by Devon in April 2003 in conjunction with the merger with Ocean Energy. The fair value and effective rates of this note at the time assumed was $169 million and 6.5%. This instrument is the unsecured and unsubordinated obligation of Devon OEI Operating, L.L.C. and is guaranteed by Devon Energy Production Company, L.P. Each of these entities is a wholly-owned subsidiary of Devon.

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