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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, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) Project	Dec. 31, 2017 USD ($) Project	Dec. 31, 2016 USD ($) Project
Changes in company's suspended exploratory well costs
Beginning balance at January 1	$ 3,702	$ 3,540	$ 3,312
Additions to capitalized exploratory well costs pending the determination of proved reserves	207	323	465
Reclassifications to wells, facilities and equipment based on the determination of proved reserves	(13)	(113)	(119)
Capitalized exploratory well costs charged to expense	(333)	(39)	(118)
Other reductions	0	(9)	0
Ending balance at December 31	3,563	3,702	3,540
Aging of capitalized well costs and number of project
Exploratory well costs capitalized for a period of one year or less				$ 202	$ 307	$ 445
Exploratory well costs capitalized for a period greater than one year				3,361	3,395	3,095
Balance at December 31	$ 3,702	$ 3,540	$ 3,312	$ 3,563	$ 3,702	$ 3,540
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project				30	32	35

X

- Definition

Capitalized exploratory well cost, other deductions in property sales.

+ References

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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=68064819&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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 932
-SubTopic 235
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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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