Supplemental Information on Oil and Gas Producing Activities (Unaudited) - Discounted future cash flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Oil and gas reserves
Future cash inflows computation period	12 months		12 months
Discount rate for annual net cash inflows (as a percent)	10.00%	10.00%	10.00%
Annual net cash inflows
Period of unweighted first day of the month average prices used to compute future cash inflows	12 months
Future cash inflows	$ 109,052	$ 74,622	$ 37,845
Future production costs	(39,378)	(34,665)	(32,202)
Future development costs	(2,073)	(1,704)	(1,685)
Future net cash flows before income tax	67,601	38,253	3,958
Future income tax expense	(13,692)	(7,813)
Future net cash flows	53,909	30,440	3,958
10% annual discount for estimated timing of cash flows	(30,345)	(17,007)	(2,748)
Standardized measure of discounted future net cash flows	23,564	13,433	1,210	$ 5,469
VIE, Martica
Annual net cash inflows
Standardized measure of discounted future net cash flows	$ 458	$ 501	$ 359