Retirement Plans - Components of Net Periodic Pension Cost (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Net non-service pension (income) costs included in Other, net	$ 9	$ 16	$ 19	$ 32

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