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Accounting for Suspended Exploratory Wells (Details) $ in Millions | 12 Months Ended |  |  |
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) Project | Dec. 31, 2016 USD ($) Project | Dec. 31, 2015 USD ($) Project
Changes in company's suspended exploratory well costs |  |  |  |  |  |
Beginning balance at January 1 | $ 3,540 | $ 3,312 | $ 4,195 |  |  |
Additions to capitalized exploratory well costs pending the determination of proved reserves | 323 | 465 | 869 |  |  |
Reclassifications to wells, facilities and equipment based on the determination of proved reserves | (113) | (119) | (164) |  |  |
Capitalized exploratory well costs charged to expense | (39) | (118) | (1,397) |  |  |
Other reductions | (9) | 0 | (191) |  |  |
Ending balance at December 31 | 3,702 | 3,540 | 3,312 |  |  |
Aging of capitalized well costs and number of project |  |  |  |  |  |
Exploratory well costs capitalized for a period of one year or less |  |  |  | $ 307 | $ 445 | $ 489
Exploratory well costs capitalized for a period greater than one year |  |  |  | 3,395 | 3,095 | 2,823
Balance at December 31 | $ 3,540 | $ 3,312 | $ 4,195 | $ 3,702 | $ 3,540 | $ 3,312
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project |  |  |  | 32 | 35 | 39

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- Definition Capitalized exploratory well cost, other deductions in property sales. + References No definition available. + Details
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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + 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 amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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- 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. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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