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v3.20.2

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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