Property Plant and Equipment - Additional Information (Detail) $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($) well
Capitalized Exploratory Well Costs [Line Items]
Previously capitalized well cost expensed	$ 125
Capitalized exploratory well costs that have been capitalized for period greater than one year	360
Northern Portion of Shenzi Field, Gulf of Mexico
Capitalized Exploratory Well Costs [Line Items]
Previously capitalized well cost expensed	$ 125
Project interest percentage	28.00%
Oldfield-1 Exploration Well in Gulf of Mexico
Capitalized Exploratory Well Costs [Line Items]
Well costs incurred and expensed	$ 10
Successful Exploration Wells on the Stabroek Block, Offshore Guyana
Capitalized Exploratory Well Costs [Line Items]
Project interest percentage	30.00%
Capitalized well costs percentage	80.00%
JDA, Gulf of Thailand
Capitalized Exploratory Well Costs [Line Items]
Project interest percentage	50.00%
Capitalized well costs percentage	10.00%
Number of successful exploration wells drilled \| well	3
North Malay Basin, Offshore Peninsular Malaysia
Capitalized Exploratory Well Costs [Line Items]
Capitalized well costs percentage	10.00%
Project interest percentage	50.00%
Number of successful exploration wells drilled \| well	5

Represents capitalized well cost greater than one year attributable to project.

No definition available.

Name:	hes_CapitalizedWellCostsGreaterThanOneYearAttributableToProject
Namespace Prefix:	hes_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Project interest percentage.

+ References

No definition available.

+ Details

Name:	hes_ProjectInterestPercentage
Namespace Prefix:	hes_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of participation interest in exploration project.

+ References

No definition available.

+ Details

Name:	hes_ProjectParticipationInterestPercentage
Namespace Prefix:	hes_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Well costs incurred and expensed in the same year.

+ References

No definition available.

+ Details

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

- Definition

Number of exploratory oil and gas wells capable of producing either oil or gas in sufficient quantity to justify completion as oil or gas well.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1205
-Paragraph (a)
-Subparagraph (1)

+ Details

Name:	srt_ExploratoryWellsDrilledNetProductive
Namespace Prefix:	srt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

+ Details

Name:	us-gaap_CapitalizedExploratoryWellCostChargedToExpense1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

+ Details

Name:	us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hes_NorthernPortionOfShenziFieldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hes_OldfieldOneExplorationWellInGulfOfMexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hes_SuccessfulExplorationWellsOnStabroekBlockOffshoreGuyanaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hes_JDAGulfOfThailandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hes_NorthMalayBasinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: