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Capitalized Exploratory Well Costs - Aging of Capitalized Costs (Details) $ in Millions | Dec. 31, 2020 USD ($) project | Dec. 31, 2019 USD ($) project | Dec. 31, 2018 USD ($) project | Dec. 31, 2017 USD ($)
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Extractive Industries [Abstract] |  |  |  |
Exploratory well costs capitalized for a period of one year or less | $ 0 | $ 7 | $ 34 |
Exploratory well costs capitalized for a period greater than one year | 0 | 0 | 2 |
Exploratory well costs capitalized | $ 0 | $ 7 | $ 36 | $ 36
Number of projects with exploratory well costs capitalized for a period greater than one year | project | 0 | 0 | 7 |

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- References No definition available. + 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=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://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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- 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=68064819&loc=SL6806780-109447 + Details
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