Impairment and Other (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) $ / bbl	Dec. 31, 2021 USD ($) u_hesLease	Dec. 31, 2020 USD ($)
Impairments [Line Items]
Loss contingency charge, pre-tax		$ 147
Loss contingency charge, after tax		$ 147
Number of offshore Gulf of Mexico leases abandoned | u_hesLease		7
Oil and Gas Properties
Impairments [Line Items]
Fair value of estimated impairment charges determined using internal projected discounted cash flows	$ 1,050
Weighted average crude oil benchmark price for impaired assets (US dollar per barrel) | $ / bbl	48.82
Discount rate used in fair value measurements	10.00%
Oil and Gas Properties | West Texas Intermediate
Impairments [Line Items]
Future strip crude oil price (US dollar per barrel) used in impairment | $ / bbl	50
Oil and Gas Properties | Brent
Impairments [Line Items]
Future strip crude oil price (US dollar per barrel) used in impairment | $ / bbl	55
Oil and Gas Properties | North Malay Basin in Malaysia
Impairments [Line Items]
Impairment charge, pre-tax			$ 755
Impairment charge, after income taxes			755
Oil and Gas Properties | South Arne Field in Denmark
Impairments [Line Items]
Impairment charge, pre-tax			670
Impairment charge, after income taxes			594
Oil and Gas Properties | Stampede Field in Gulf of Mexico
Impairments [Line Items]
Impairment charge, pre-tax			410
Impairment charge, after income taxes			410
Oil and Gas Properties | Tubular Bells Field in Gulf of Mexico
Impairments [Line Items]
Impairment charge, pre-tax			270
Impairment charge, after income taxes			270
Other Assets
Impairments [Line Items]
Impairment charge, pre-tax			21
Impairment charge, after income taxes			$ 20