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Accounting For Suspended Exploratory Well Costs (Schedule Of Period End Capitalized Suspended Exploratory Well Costs) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Capitalized Exploratory Well Costs [Line Items] |  |  |  |
Capitalized for a period of one year or less | $ 453 | $ 200 | $ 378 |
Capitalized for a period greater than one year - subtotal | 3,147 | 3,359 | 3,134 |
Total | 3,600 | 3,559 | 3,512 | $ 4,120
Capitalized For A Period Of Between One And Five Years [Member] |  |  |  |
Capitalized Exploratory Well Costs [Line Items] |  |  |  |
Capitalized for a period greater than one year - subtotal | 583 | 1,030 | 969 |
Capitalized For A Period Of Between Five And Ten Years [Member] |  |  |  |
Capitalized Exploratory Well Costs [Line Items] |  |  |  |
Capitalized for a period greater than one year - subtotal | 1,544 | 1,411 | 1,410 |
Capitalized For A Period Of Greater Than Ten Years [Member] |  |  |  |
Capitalized Exploratory Well Costs [Line Items] |  |  |  |
Capitalized for a period greater than one year - subtotal | $ 1,020 | $ 918 | $ 755 |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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- Definition Amount of exploratory well cost capitalized for period of greater than one year after completion of drilling in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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- Definition Amount of exploratory well cost capitalized for period of one year or less after completion of drilling in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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