Asset impairment charges other non-core projects.

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- Definition

Percentage decrease in planned capital investment.

+ References

No definition available.

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- Definition

Impairment charge discount rate.

+ References

No definition available.

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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)

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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

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Asset Impairments (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
Asset Impairments (Narrative) (Details) $ in Millions	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