Retirement Plans - Components of Net Periodic Pension Cost (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Net non-service pension (income) costs included in Other, net	$ 79	$ (17)	$ 60	$ (49)

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