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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 6,363
Net premium (discount) on debentures and notes		171	$ (20)
Debt issuance costs		(32)	(31)
Long-term debt		6,502	$ 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 six 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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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