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Accounting for Suspended Exploratory Wells - Aging of Costs on a Well and Project Basis (Details) $ in Millions	Dec. 31, 2018 USD ($) Well Project	Dec. 31, 2017 USD ($) Project	Dec. 31, 2016 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	$ 3,361	$ 3,395	$ 3,095
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	153
Number of projects (in projects) | Project	30	32	35
1998-2007
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	$ 410
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	31
2008-2012
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	$ 1,076
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	61
2013-2017
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	$ 1,875
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	61
2003-2010
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	$ 338
Number of projects (in projects) | Project	5
2011-2014
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	$ 894
Number of projects (in projects) | Project	10
2015-2018
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	$ 2,129
Number of projects (in projects) | Project	15

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 http://asc.fasb.org/extlink&oid=68064819&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
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-SubTopic 235
-Section 50
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