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Debt And Related Expenses (Narrative) (Details) $ in Millions			3 Months Ended
	Sep. 15, 2024 USD ($)	Aug. 12, 2024 USD ($)	Mar. 31, 2025 USD ($)	Aug. 28, 2024 USD ($)
Debt Instrument [Line Items]
Maturity date extension			in the first quarter of 2025, Devon exercised its option to extend the Senior Credit Facility maturity date from March 24, 2029 to March 24, 2030
Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount		$ 2,000
Outstanding credit facility borrowings		1,000
Debt-to-capitalization ratio			0.263
Interest rate on the term loan			5.80%
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, borrowing capacity			$ 3,000
Outstanding credit facility borrowings			$ 0
Debt-to-capitalization ratio			0.263
Outstanding letters of credit			$ 4
Senior Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio			0.65
Tranche One [Member] \| Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount		500,000
Tranche Two [Member] \| Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount		$ 1,500
Senior Notes [Member] \| Devon [Member]
Debt Instrument [Line Items]
Repayments of Related Party Debt	$ 472
Debt interest rate, stated percentage	5.25%
5.2% due 2034 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Issuance of Senior Long-Term Debt				$ 1,250
Debt interest rate, stated percentage				5.20%
5.75% due 2054 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Issuance of Senior Long-Term Debt				$ 1,000
Debt interest rate, stated percentage				5.75%