Leases - Schedule of Consolidated Balance Sheet Information Related to Operating and Finance Leases (Parenthetical) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Finance lease, right-of-use assets, amortization cost	$ 381
Finance lease, right-of-use assets, accumulated amortization	$ 73

Finance lease, right-of-use asset, accumulated amortization.

No definition available.

Name:	hes_FinanceLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix:	hes_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant