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Impairments Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges | $ 44.0 | $ 6.0 |  | $ 21.0 | $ 6,475.0 |
Exploration Expense | $ 103.0 | $ 73.0 | [1],[2] | 267.0 | 720.0 | [1],[2]
Alaska Segment [Member] | Operating Segments [Member] | Point Thomson [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 174.0 |
Lower Forty Eight Segment [Member] | Operating Segments [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 55.0 |  |
Lower Forty Eight Segment [Member] | Operating Segments [Member] | Barnett [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 600.0 |
Lower Forty Eight Segment [Member] | Operating Segments [Member] | San Juan Properties [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 3,300.0 |
Lower Forty Eight Segment [Member] | Operating Segments [Member] | GOM | Shenandoah [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Exploration Expense |  |  |  |  | $ 51.0 |
Europe and North Africa Segment [Member] | Operating Segments [Member] | UK Field [Member] |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 49.0 |  |
[1] | *Certain amounts have been reclassified to conform to the current-period presentation resulting from the adoption of ASU No. 2017-07.
[2] | See Note 2—Changes in Accounting Principles, for additional information.

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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=109223946&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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- 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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