Property, Plant and Equipment - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($) well
Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year \| $	$ 451
Stabroek Block, Offshore Guyana
Capitalized Exploratory Well Costs [Line Items]
Capitalized well costs percentage	90.00%
Project interest percentage	30.00%
JDA, Gulf of Thailand
Capitalized Exploratory Well Costs [Line Items]
Capitalized well costs percentage	5.00%
Project interest percentage	50.00%
Number of successful exploration wells drilled	3
North Malay Basin, Offshore Peninsular Malaysia
Capitalized Exploratory Well Costs [Line Items]
Capitalized well costs percentage	5.00%
Project interest percentage	50.00%
Number of successful exploration wells drilled	1

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

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- Definition

Project interest percentage.

+ References

No definition available.

+ Details

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- 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

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- 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

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- 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=123377692&loc=SL6806780-109447

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