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v3.21.2

Impairment (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / bbl | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / bbl | Sep. 30, 2020 USD ($) | Sep. 30, 2021 MMcf
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Commodity price (usd per unit) |  | 57.69 |  | 57.69 |  | 2.94
Full cost ceiling limitation impairment |  | $ 0 |  | $ 0 | $ 215,800,000 |
Impairment charge |  |  | $ 44,000,000 |  | 253,800,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Corporate Headquarters Building |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment charge | $ 38,000,000 |  |  |  | $ 38,000,000 |

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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