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v3.20.2

Impairments Long-lived Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Oil and Gas Properties | CO2 |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Asset impairment charges | $ 0 | $ 350 | $ 0 | $ 350 | $ 0
Valuation Technique, Discounted Cash Flow | CO2 |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated Weighted Average Cost Of Capital |  | 9.25% |  |  |
Valuation Technique, Discounted Cash Flow | Oil and Gas Properties | CO2 |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated Weighted Average Cost Of Capital |  | 10.50% |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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