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Accounting for Suspended Exploratory Wells (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Well Project	Dec. 31, 2016 USD ($) Project	Dec. 31, 2015 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 | $	$ 3,395	$ 3,095	$ 2,823
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	32	35	39
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	158
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 | $	$ 2,257
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	17
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 | $	$ 1,138
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	15
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 | $	$ 190
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	2
Undergoing front-end engineering and design with final investment decision expected in three years	4 years
Development Concept Under Review by Government
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 | $	$ 99
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	1
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 | $	$ 826
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	7
Miscellaneous Activities for Projects with Smaller Amounts Suspended
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 | $	$ 23
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	5

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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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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-Topic 932
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-Section 50
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