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Impact of the Covid-19 pandemic and oil price decline (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Impact of the Covid-19 pandemic and oil price decline [abstract] |  |  |  |  |  |
Long-term risk-free interest rates, increase or (decrease) | (1.30%) |  |  | (1.30%) |  |
Discount rate applied for ARO estimation increase (decrease) | (0.60%) |  |  | (0.60%) |  |
Petroleum tax rate |  |  |  | 56.00% |  |
Ordinary corporate tax |  |  |  | 22.00% |  |
The impact of the retrospective application of the temporary changes in the tax regulation |  | $ 115 |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 189 | $ 193 | $ 267 | $ 382 | $ 573 | $ 473
Low range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Accumulated tax uplift for the special tax | 20.80% |  |  | 20.80% |  |
High range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Accumulated tax uplift for the special tax | 24.00% |  |  | 24.00% |  |
Other price risk [member] | Low range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Percentage of reasonably possible change, market risk | (50.00%) |  |  | (50.00%) |  |
Other price risk [member] | High range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Percentage of reasonably possible change, market risk | 100.00% |  |  | 100.00% |  |
Commodity price sensitivity [member] | Low range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Percentage of reasonably possible change, market risk | (50.00%) |  |  | (50.00%) |  | (30.00%)
Commodity price sensitivity [member] | High range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Percentage of reasonably possible change, market risk | 100.00% |  |  | 100.00% |  | 30.00%
Commodity price sensitivity [member] | Crude oil and refined products [member] | Low range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 80 |  |  |  |  | $ 569
Commodity price sensitivity [member] | Crude oil and refined products [member] | High range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | (169) |  |  |  |  | (563)
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Low range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | 187 |  |  |  |  | (33)
Commodity price sensitivity [member] | Natural gas and electricity [Member] | High range value [member] |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 496 |  |  |  |  | $ 49

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