Impairment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Impairments [Line Items]
Impairment, pre-tax	$ 132	$ 82	$ 54
Conger Field in Gulf of America
Impairments [Line Items]
Impairment, pre-tax	92
Impairment, after income taxes	92
Uneconomic Properties in Gulf of America
Impairments [Line Items]
Impairment, pre-tax	40
Impairment, after income taxes	$ 38
West Delta Field in the Gulf of America
Impairments [Line Items]
Impairment, pre-tax		82
Impairment, after income taxes		$ 82
Non-Producing Properties in Gulf of America
Impairments [Line Items]
Impairment, pre-tax			28
Impairment, after income taxes			28
Penn State Field in Gulf of America
Impairments [Line Items]
Impairment, pre-tax			26
Impairment, after income taxes			$ 26