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Accounting for suspended exploratory well costs | 12 Months Ended
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Dec. 31, 2019
Accounting for suspended exploratory well costs | 16. Accounting for suspended exploratory well costs The company continues capitalization of exploratory well costs when the well has found a sufficient quantity of reserves to justify its completion as a producing well and the company is making sufficient progress assessing the reserves and the economic and operating viability of the project. The term “project” as used in this report can refer to a variety of different activities and does not necessarily have the same meaning as in any government payment transparency reports. Exploratory well costs that were capitalized in prior years as part of the Horn River project for a period greater than one year were expensed in 2017. The following two tables provide details of the changes in the balance of suspended exploratory well costs, as well as an aging summary of those costs. Change in capitalized suspended exploratory well costs:
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Balance as at January 1 |  |  | - |  |  |  | - |  |  |  | 143 |
Additions pending the determination of proved reserves |  |  | - |  |  |  | - |  |  |  | - |
Charged to expense |  |  | - |  |  |  | - |  |  |  | (143 | )
Reclassification to wells, facilities and equipment based on the determination of proved reserves |  |  | - |  |  |  | - |  |  |  | - |
Balance as at December 31 |  |  | - |  |  |  | - |  |  |  | - |
Period end capitalized suspended exploratory well costs:
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Capitalized for a period of one year or less |  |  | - |  |  |  | - |  |  |  | - |
Capitalized for a period of between one and ten years |  |  | - |  |  |  | - |  |  |  | - |
Capitalized for a period of greater than one year |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | - |  |  |  | - |  |  |  | - |
Exploration activity often involves drilling multiple wells, over a number of years, to fully evaluate a project. The table below provides a breakdown of the number of projects with only exploratory well costs capitalized for a period of one year or less and those that have had exploratory well costs capitalized for a period greater than one year.
|  | 2019 |  |  | 2018 |  |  | 2017 |
Number of projects that only have exploratory well costs capitalized for a period of one year or less |  |  | - |  |  |  | - |  |  |  | - |
Number of projects that have exploratory well costs capitalized for a period of greater than one year |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | - |  |  |  | - |  |  |  | - |

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- Definition The entire disclosure for parts or all of the information related to suspended well costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration