Retirement Plans - Components of Net Periodic Pension Cost (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Net non-service pension (income) costs included in Other, net	$ (15)	$ (10)

Net non service pension (income) expense costs in other net.

No definition available.

Name:	hes_NetNonServicePensionIncomeExpenseCostsInOtherNet
Namespace Prefix:	hes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration