Impairment and Other (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Asset Impairment Charges Line Items [Line Items]
Impairment and other	$ 54	$ 0	$ 54	$ 147
Non-producing Properties in Gulf of Mexico
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
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
Fieldwood
Asset Impairment Charges Line Items [Line Items]
Impairment and other				147
Impairment and other, after tax				$ 147