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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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- Definition Exploratory Wells That Have Been Capitalized For Period Greater Than One Year, Number Of Wells With Multiple Completions, Gross + References No definition available. + Details
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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://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 + Details
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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://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 + Details
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