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Accounting for Suspended Exploratory Wells - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) Well Project | Dec. 31, 2021 USD ($) Project | Dec. 31, 2020 USD ($) Project
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year | $ | $ 1,554 | $ 2,044 | $ 2,486
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project | 12 | 15 | 17
Expected period for decision on the recognition of proved reserves | 5 years |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well | 71 |  |
Drilling Activity |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year | $ | $ 945 |  |
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project | 7 |  |
No Drilling Activity |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year | $ | $ 609 |  |
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project | 5 |  |
Undergoing Front End Engineering and Design with Final Investment Decision Expected |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year | $ | $ 194 |  |
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project | 3 |  |
Undergoing front-end engineering and design with final investment decision expected in three years | 4 years |  |
Reviewing Development Alternatives |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |
Capitalized exploratory well costs that have been capitalized for period greater than one year | $ | $ 415 |  |
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project | 2 |  |

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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 https://asc.fasb.org/extlink&oid=126939881&loc=SL6806780-109447 + Details
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