Retirement Plans - Components of Net Periodic Benefit Cost (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Net non-service pension (income) costs included in Other, net	$ 55	$ (61)	$ 14

Net non-service pension (income) costs included in Other, net.

No definition available.

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