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Accounting for Suspended Exploratory Wells - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Project Well	Dec. 31, 2020 USD ($) Project	Dec. 31, 2019 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 | $	$ 2,044	$ 2,486	$ 2,827
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	15	17	22
Expected period for decision on the recognition of proved reserves	5 years
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	83
Drilling Activity
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 | $	$ 1,119
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	9
No Drilling Activity
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 | $	$ 925
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	6
Undergoing Front End Engineering and Design with Final Investment Decision Expected
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 | $	$ 486
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	4
Undergoing front-end engineering and design with final investment decision expected in three years	4 years
Reviewing Development Alternatives
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 | $	$ 439
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	2

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

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
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-URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447

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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.

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