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Property, plant and equipment - Price assumptions (Details) $ / bbl in Millions, $ / MMBTU in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020 $ / bbl $ / MMBTU	Dec. 31, 2019 $ / bbl $ / MMBTU
Brent Blend [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price | $ / bbl	41	59
Brent Blend [Member] | 2025 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price | $ / bbl	77	77
Brent Blend [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price | $ / bbl	80	80
NBP [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	3.4	4.2
NBP [Member] | 2025 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	7.0	7.0
NBP [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	7.5	7.5
Henry Hu [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	2.0	2.4
Henry Hu [Member] | 2025 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	3.1	3.1
Henry Hu [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated Crude Oil Price	3.6	3.6

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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.

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