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Accounting for Suspended Exploratory Wells (Details 1) $ in Millions | Dec. 31, 2017 USD ($) Well Project | Dec. 31, 2016 USD ($) Project | Dec. 31, 2015 USD ($) Project
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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
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well | 158 |  |
Number of projects (in projects) | Project | 32 | 35 | 39
1998-2006 |  |  |
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 | $ 318 |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well | 29 |  |
2007-2011 |  |  |
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 | $ 879 |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well | 50 |  |
2012-2016 |  |  |
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 | $ 2,198 |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well | 79 |  |
2003-2009 |  |  |
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 | $ 344 |  |
Number of projects (in projects) | Project | 5 |  |
2010-2013 |  |  |
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 | $ 367 |  |
Number of projects (in projects) | Project | 6 |  |
2014-2017 |  |  |
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 | $ 2,684 |  |
Number of projects (in projects) | Project | 21 |  |

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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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