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Supplemental Information on Oil and Gas Operations (Unaudited) (Results Of Operations) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / Boe | Dec. 31, 2022 USD ($) $ / Boe | Dec. 31, 2021 USD ($) $ / Boe
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |  |  |
Oil, gas and NGL sales | $ 10,791 | $ 14,082 | $ 9,531
Production expenses | (2,928) | (2,797) | (2,131)
Exploration expenses | (20) | (29) | (14)
Depreciation, depletion and amortization | (2,464) | (2,119) | (2,050)
Asset dispositions | (33) | 43 | 170
Accretion of asset retirement obligations | (29) | (25) | (28)
Income tax expense | (1,044) | (2,041) | (1,238)
Results of operations | $ 4,273 | $ 7,114 | $ 4,240
Depreciation, depletion and amortization per Boe | $ / Boe | 10.27 | 9.52 | 9.83

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- Definition Amortization computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479664/932-10-S99-1 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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- Definition Accretion expense of asset retirement obligations related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Exploration costs from oil and gas producing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-23 + Details
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