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Property, plant and equipment -price assumptions (narrative) (Details) $ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 € / MWh | Dec. 31, 2021 USD ($) $ / bbl | Dec. 31, 2021 USD ($) $ / MMBTU | Dec. 31, 2021 USD ($) kr / $ | Dec. 31, 2021 USD ($) kr / € | Dec. 31, 2021 USD ($) kr / t | Dec. 31, 2021 USD ($) € / t | Dec. 31, 2021 USD ($) € / MWh | Dec. 31, 2021 USD ($) $ / £ | Dec. 31, 2020 $ / bbl $ / MMBTU € / t € / MWh
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of estimated decline in commodity prices |  | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% |
Weighted Average Cost of Capital |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |
External carbon price | € / t |  |  |  |  |  |  |  |  |  | 56
Impairment exposure due to net zero emission | $ |  | $ 9 | $ 9 | $ 9 | $ 9 | $ 9 | $ 9 | $ 9 | $ 9 |
2022 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Electricity price | € / MWh | 77 |  |  |  |  |  |  | 157 |  | 61
2024 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term exchange rates |  |  |  | 8.50 | 10.0 |  |  |  | 1.35 |
2026 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
External carbon price | € / t |  |  |  |  |  |  | 80 |  |  |
2030 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Electricity price | € / MWh |  |  |  |  |  |  |  | 58 |  | 43
External carbon price | € / t |  |  |  |  |  |  | 65 |  |  | 27.5
Expected tax increase on carbon emissions maximum | kr / t |  |  |  |  |  | 2,000 |  |  |  |
2050 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
External carbon price | € / t |  |  |  |  |  |  | 100 |  |  | 41
NBP Natural Gas Price [Member] | 2030 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit |  |  | 6.4 |  |  |  |  |  |  | 6.7
NBP Natural Gas Price [Member] | 2040 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit |  |  | 7.7 |  |  |  |  |  |  | 8.0
NBP Natural Gas Price [Member] | 2050 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit |  |  | 7.0 |  |  |  |  |  |  | 7.7
Henry Hub Natural Gas Price [Member] | 2030 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit |  |  | 3.2 |  |  |  |  |  |  | 3.3
Henry Hub Natural Gas Price [Member] | 2040 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit |  |  | 3.3 |  |  |  |  |  |  | 3.8
Brent Blend oil price [member] | 2025 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit | $ / bbl |  | 65 |  |  |  |  |  |  |  | 67
Brent Blend oil price [member] | 2040 [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit | $ / bbl |  | 64 |  |  |  |  |  |  |  | 66
Brent Blend oil price [member] | 2050 [member] | Maximum [member] |  |  |  |  |  |  |  |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit | $ / bbl |  | 60 |  |  |  |  |  |  |  |

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