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Reversals (Impairments) of tangible and intangible assets and right-of-use assets. Sensitivity of outcomes to alternative scenarios - Additional Information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent) | 7.00% |  |
Net impairment losses | € 1,140 | € 167 | € 3,183
Percentage by which headroom is higher than book value | 100.00% |  |
Congo, Egypt, USA and Algeria |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Net impairment losses | € 432 |  |
Chemicals |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Property, plant and equipment, residual value | 595 |  |
Gas power generation |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Property, plant and equipment, residual value | € 690 |  |
Minimum |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Post-tax, risk-adjusted WACC (in percent) | 6.20% |  |
Maximum |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Post-tax, risk-adjusted WACC (in percent) | 11.10% |  |

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