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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, 2020 USD ($) $ / Boe | Dec. 31, 2019 USD ($) $ / Boe | Dec. 31, 2018 USD ($) $ / Boe
Oil And Gas Exploration And Production Industries Disclosures [Abstract] |  |  |
Oil, gas and NGL sales | $ 2,695 | $ 3,809 | $ 4,085
Production expenses | (1,123) | (1,197) | (1,153)
Exploration expenses | (167) | (58) | (128)
Depreciation, depletion and amortization | (1,207) | (1,398) | (1,134)
Asset dispositions |  | 37 | 276
Asset impairments | (2,664) |  | (109)
Accretion of asset retirement obligations | (20) | (21) | (26)
Income tax expense |  | (270) | (416)
Results of operations | $ (2,486) | $ 902 | $ 1,395
Depreciation, depletion and amortization per Boe | $ / Boe | 9.90 | 11.72 | 10.51

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(i)) -URI http://asc.fasb.org/extlink&oid=120398226&loc=d3e511914-122862 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Accretion expense of asset retirement obligations related to oil and gas producing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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