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Accounting for Suspended Exploratory Wells - Summary of Changes and Aging of Capitalized Well Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Project	Dec. 31, 2020 USD ($) Project	Dec. 31, 2019 USD ($) Project
Changes in company's suspended exploratory well costs
Beginning balance at January 1	$ 2,512	$ 3,041	$ 3,563
Additions to capitalized exploratory well costs pending the determination of proved reserves	56	28	244
Reclassifications to wells, facilities and equipment based on the determination of proved reserves	(425)	(102)	(500)
Capitalized exploratory well costs charged to expense	(34)	(667)	(125)
Other reductions	0	212	(141)
Ending balance at December 31	2,109	2,512	3,041
Aging of capitalized well costs and number of project
Exploratory well costs capitalized for a period of one year or less	65	26	214
Exploratory well costs capitalized for a period greater than one year	2,044	2,486	2,827
Balance at December 31	$ 2,109	$ 2,512	$ 3,041
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	15	17	22

X

- Definition

Capitalized exploratory well cost, other deductions in property sales and acquisitions.

+ References

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- Definition

Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
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- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

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-Topic 932
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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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The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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- Definition

Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

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