Impairment and Other (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Asset Impairment Charges Line Items [Line Items]
Impairment and other	$ 0		$ 54	$ 82	$ 54
West Delta Field in the Gulf of Mexico Member [Member]
Asset Impairment Charges Line Items [Line Items]
Impairment and other		$ 82
Impairment and other, after tax		$ 82
Non-producing Properties in Gulf of Mexico [Member]
Asset Impairment Charges Line Items [Line Items]
Impairment of proved oil and gas properties, pre-tax			28
Impairment of proved oil and gas properties, after-tax			28
Penn State Field in Gulf of Mexico Member [Member]
Asset Impairment Charges Line Items [Line Items]
Impairment of proved oil and gas properties, pre-tax			26
Impairment of proved oil and gas properties, after-tax			$ 26