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v3.20.4

Asset Impairments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / bbl $ / Mcf | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Capital investment percentage |  | 45.00% |  |
Percentage of weighted average cost inventory |  | 9.00% |  |
Asset impairments |  | $ 2,693 |  | $ 156
Exploration expenses |  | 167 | $ 58 | 128
Proved Asset Impairments [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Asset impairments | $ 2,700 | 2,700 |  | 109
Non-oil and Gas Asset Impairments [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Asset impairments | $ 29 |  |  | 47
Unproved Impairments [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Exploration expenses |  | 152 | $ 18 | $ 95
Impairments charges related to non-core acreage |  | 36 |  |
Rockies [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Exploration expenses |  | $ 116 |  |
WTI [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / bbl |  | 39 |  |
WTI [Member] | Minimum [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / bbl |  | 23 |  |
WTI [Member] | Maximum [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / bbl |  | 50 |  |
Henry Hub [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / Mcf |  | 1.85 |  |
Henry Hub [Member] | Minimum [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / Mcf |  | 1.29 |  |
Henry Hub [Member] | Maximum [Member] |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Oil and gas average sale price | $ / Mcf |  | 2.63 |  |

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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