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Accounting for suspended exploratory well costs (Tables) | 12 Months Ended
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Dec. 31, 2014
Change in Capitalized Suspended Exploratory Well Costs | Change in capitalized suspended exploratory well costs:
millions of dollars |  | 2014 |  |  | 2013 |  |  | 2012 |
Balance as at January 1 |  |  | 173 |  |  |  | 167 |  |  |  | 163 |
Additions pending the determination of proved reserves |  |  | 5 |  |  |  | 12 |  |  |  | 16 |
Charged to expense |  |  | - |  |  |  | - |  |  |  | - |
Reclassification to wells, facilities and equipment based on the determination of proved reserves |  |  | (11) |  |  |  | (6) |  |  |  | (12) |
Balance as at December 31 |  |  | 167 |  |  |  | 173 |  |  |  | 167 |
Schedule of Aging of Capitalized Exploratory Well Costs | Period end capitalized suspended exploratory well costs:
millions of dollars |  | 2014 |  |  | 2013 |  |  | 2012 |
Capitalized for a period of one year or less |  |  | - |  |  |  | 6 |  |  |  | 16 |
Capitalized for a period of between one and five years |  |  | 167 |  |  |  | 167 |  |  |  | 151 |
Capitalized for a period of greater than one year |  |  | 167 |  |  |  | 167 |  |  |  | 151 |
Total |  |  | 167 |  |  |  | 173 |  |  |  | 167 |
Number of Projects With Suspended Exploratory Well Costs | The table below provides a numerical breakdown of the number of projects with suspended exploratory well costs which had their first capitalized well drilled in the preceding 12 months and those that have had exploratory well costs capitalized for a period greater than 12 months.
|  | 2014 |  |  | 2013 |  |  | 2012 |
Number of projects with first capitalized well drilled in the preceding 12 months |  |  | - |  |  |  | - |  |  |  | - |
Number of projects that have exploratory well costs capitalized for a period of greater than 12 months |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
Total |  |  | 1 |  |  |  | 1 |  |  |  | 1 |

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- Definition Number of projects with suspended exploratory wells. + References No definition available. + Details
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- Definition Tabular disclosure of the change in capitalized exploratory costs during the 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=8451039&loc=SL6806780-109447 + Details
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- Definition Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + 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=8451039&loc=SL6806780-109447 + Details
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