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Accounts Receivable (Schedule Of Components Of Accounts Receivable) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Joint interest billings	$ 367	$ 341
Other	32	42
Gross accounts receivable	2,043	1,978
Allowance for doubtful accounts	(7)	(6)
Net accounts receivable	2,036	1,972
Oil Gas And N G L Sales [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	1,151	1,130
Marketing And Midstream Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 493	$ 465

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