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Property, plant and equipment -price assumptions used for impairment calculations (Details) $ in Billions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / bbl $ / MMBTU | Dec. 31, 2018 $ / bbl $ / MMBTU
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Description of changes in methods and assumptions used in preparing sensitivity analysis | This illustrative impairment sensitivity, based on a simplified method, assumes no changes to input factors other than prices; however, a price reduction of 30% is likely to result in changes in business plans as well as other factors used when estimating an asset’s recoverable amount. |
Estimated impairment loss due to decline in commodity prices | $ | $ 15 |
Percentage of estimated decline in commodity prices | 30.00% |
Brent Blend [Member] | 2020 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | $ / bbl | 59 | 68
Brent Blend [Member] | 2025-2029 [Member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | $ / bbl | 77 | 78
Brent Blend [Member] | 2030 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | $ / bbl | 80 | 82
NBP Natural Gas Price [Member] | 2020 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 4.2 | (7.7)
NBP Natural Gas Price [Member] | 2025-2029 [Member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 7 | (8.2)
NBP Natural Gas Price [Member] | 2030 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 7.5 | (8.2)
Henry Hub Natural Gas Price [Member] | 2020 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 2.4 | (3.2)
Henry Hub Natural Gas Price [Member] | 2025-2029 [Member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 3.1 | (4.1)
Henry Hub Natural Gas Price [Member] | 2030 [member] |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |
Estimated crude oil or Gas price per unit | 3.6 | (4.1)

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- Definition Crude oil or gas price assumption used for impairment calculations in each geographic area during the reporting period, presented in USD per unit, number of barrels of oil or mmbtu. + References No definition available. + Details
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- Definition Potential impairment losses related to property plant and equipment due to decline in commodity prices. + References No definition available. + Details
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- Definition Percentage of estimated decline in commodity price forecasts over the lifetime of the assets. + References No definition available. + Details
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- Definition The description of changes in the methods and assumptions used in preparing a sensitivity analysis for the types of market risk to which the entity is exposed. [Refer: Market risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 40 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_40_c&doctype=Standard -URIDate 2019-03-27 + Details
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