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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net premium (discount) on debentures and notes		$ (226)	$ 20
Debt issuance costs		(31)	(31)
Total debt		7,268	4,298
Short-term debt		226
Long-term debt		7,042	$ 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
5.75% due June 1, 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	[1]	$ 500
Debt interest rate, stated percentage		5.75%	5.75%
Debt, maturity date		Jun. 01, 2026
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]	$ 600
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. These instruments are 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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Contractual interest rate for funds borrowed, under the debt agreement.

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