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Accounting for Suspended Exploratory Wells - Aging of Costs on a Well and Project Basis (Details) $ in Millions	Dec. 31, 2022 USD ($) Well Project	Dec. 31, 2021 USD ($) Project	Dec. 31, 2020 USD ($) Project
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 1,554	$ 2,044	$ 2,486
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	71
Number of projects (in projects) | Project	12	15	17
2000-2009
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 263
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	14
2010-2014
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 1,121
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	49
2015-2021
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 170
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	8
2008-2013
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 428
Number of projects (in projects) | Project	5
2014-2018
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 1,083
Number of projects (in projects) | Project	6
2019-2022
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 43
Number of projects (in projects) | Project	1

X

- Definition

Exploratory Wells That Have Been Capitalized For Period Greater Than One Year, Number Of Wells With Multiple Completions, Gross

+ References

No definition available.

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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 https://asc.fasb.org/extlink&oid=126939881&loc=SL6806780-109447

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- Definition

The number of projects for which exploratory well costs 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
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