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Exploratory Well Costs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) well | Dec. 31, 2020 USD ($) well | Dec. 31, 2019 USD ($) well
Capitalized Exploratory Well Costs [Abstract] |  |  |  |  |
Balance at January 1 |  | $ 29 | $ 26 |  | $ 4
Additions Pending the Determination of Proved Reserves |  | 73 | 108 |  | 83
Reclassifications to Proved Properties |  | (41) | (81) |  | (39)
Costs Charged to Expense (1) | [1] | (54) | (24) |  | (22)
Balance at December 31 |  | $ 7 | $ 29 |  | $ 26
Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects | well |  | 0 | 1 |  | 0
Capitalized Exploratory Well Costs that Have Been Capitalized for Period of One Year or Less |  | $ 7 | $ 26 |  | $ 26
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year |  | $ 0 | $ 3 | [2] | $ 0
[1] | Includes capitalized exploratory well costs charged to either dry hole costs or impairments.
[2] | (1) Consists of costs related to a project in the United States at December 31, 2020.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123377692&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123377692&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://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=123377692&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://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=123377692&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 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://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=123377692&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447 + Details
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