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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 6,363 |
Net premium (discount) on debentures and notes |  | 160 | $ (20)
Debt issuance costs |  | (31) | (31)
Long-term debt |  | 6,492 | $ 4,298
8.25% due August 1, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | $ 242 |
Debt interest rate, stated percentage |  | 8.25% | 8.25%
Debt, maturity date |  | Aug. 01, 2023 |
5.25% due September 15, 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | $ 472 |
Debt interest rate, stated percentage |  | 5.25% | 5.25%
Debt, maturity date |  | Sep. 15, 2024 |
5.85% due December 15, 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 485 | $ 485
Debt interest rate, stated percentage |  | 5.85% | 5.85%
Debt, maturity date |  | Dec. 15, 2025 |
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 | [1] | $ 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 | [1] | $ 325 |
Debt interest rate, stated percentage |  | 5.875% | 5.875%
Debt, maturity date |  | Jun. 15, 2028 |
4.50% due January 15, 2030 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | $ 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 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 |
[1] | These instruments were assumed by Devon in January 2021 in conjunction with the Merger. Subsequent to debt retirements and the obligor exchange transaction completed during the first nine months of 2021, approximately $51 million of these instruments remain the unsecured and unsubordinated obligation of WPX, a wholly-owned subsidiary of Devon

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