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Capitalized Exploratory Well Costs (Tables) | 12 Months Ended
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Dec. 31, 2020
Extractive Industries [Abstract] |
Summary of changes in capitalized well costs | A summary of the changes in our capitalized well costs for the years ended December 31, 2020, 2019 and 2018 is detailed below. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (in millions)
Balance as of January 1 |  | $ | 7 |  |  | $ | 36 |  |  | $ | 36 |
Additions pending the determination of proved reserves |  | — |  |  | 7 |  |  | 74 |
Divestitures and other |  | — |  |  | (3) |  |  | — |
Reclassifications to proved properties |  | — |  |  | (17) |  |  | (40) |
Charges to exploration expense |  | (7) |  |  | (16) |  |  | (34) |
Balance as of December 31 |  | $ | — |  |  | $ | 7 |  |  | $ | 36 |
Schedule of aging of capitalize costs and the number of projects for which exploratory well costs have been capitalized | The following table provides an aging of capitalized costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the completion of drilling.
|  | 2020 |  | 2019 |  | 2018
|  | (in millions)
Exploratory well costs capitalized for a period of one year or less |  | $ | — |  |  | $ | 7 |  |  | $ | 34 |
Exploratory well costs capitalized for a period greater than one year |  | — |  |  | — |  |  | 2 |
Balance as of December 31 |  | $ | — |  |  | $ | 7 |  |  | $ | 36 |
Number of projects with exploratory well costs capitalized for a period greater than one year |  | — |  |  | — |  |  | 7 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&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://fasb.org/us-gaap/role/ref/legacyRef -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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