Leases - Schedule of Consolidated Balance Sheet Information Related to Operating and Finance Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets — net	$ 426	$ 447
Finance lease right-of-use assets — net	168	299
Operating Leases, Lease obligations:
Operating Lease, Liability, Current	63	182
Operating Lease, Liability, Noncurrent	478	353
Total lease obligations	541	535
Financing Leases, Lease obligations:
Finance Lease, Liability, Current	18	17
Finance Lease, Liability, Noncurrent	220	238
Total lease obligations	238	255
Finance lease ROU assets cost	212	381
Finance lease ROU assets accumulated amortization	$ 44	$ 82
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	hes:OperatingAndFinanceLeaseLiabilitiesCurrent	hes:OperatingAndFinanceLeaseLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	hes:OperatingAndFinanceLeaseLiabilitiesCurrent	hes:OperatingAndFinanceLeaseLiabilitiesCurrent