Dispositions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset sales	$ 16	$ 3	$ 178
Gain (loss) on asset sales, pre-tax	$ 1	$ 2	101
Interest in Waha Concession in Libya
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Participation interest percentage				8.00%
Proceeds from asset sales			150
Gain (loss) on asset sales, pre-tax			76
Gain (loss) on asset sale, after income taxes			76
Former Downstream Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset sales			24
Gain (loss) on asset sales, pre-tax			22
Gain (loss) on asset sale, after income taxes			$ 22