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Business combinations and other significant transactions (Details) € in Millions, t in Millions | Nov. 02, 2021 EUR (€) | Oct. 22, 2021 EUR (€) MW GW | Oct. 04, 2021 EUR (€) GW MW | Jul. 29, 2021 EUR (€) MW | Jun. 03, 2021 EUR (€) item MW | Apr. 07, 2021 EUR (€) customer | Feb. 26, 2021 EUR (€) GW MW | Dec. 31, 2021 EUR (€) | Oct. 28, 2021 EUR (€) | Mar. 10, 2021 EUR (€) t | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
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Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | € 2,222 |  |  | € 112 | € 5
Net financial liabilities |  |  |  |  |  |  |  | 614 |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | 163 |  |  |  |
Goodwill |  |  |  |  |  |  |  | 1,574 |  |  |  |
UK Dogger Bank |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | € 480 |  |  |  |  |
Power generating capacity, projected | GW |  |  |  |  |  |  | 2.4 |  |  |  |  |
Proportion of ownership interest acquired |  |  |  |  |  |  | 20.00% |  |  |  |  |
Renewable energy capacity | MW |  |  |  |  |  |  | 480 |  |  |  |  |
Union Fenosa Gas SA |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Cash adjustment |  |  |  |  |  |  |  |  |  | € 32 |  |
Net financial liabilities |  |  |  |  |  |  |  |  |  | 128 |  |
Cash and cash equivalents |  |  |  |  |  |  |  | 42 |  | 42 |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | 200 |  |
Goodwill |  |  |  |  |  |  |  | € 2 |  | € 2 |  |
Damietta plant |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |
Gas liquefaction capacity | t |  |  |  |  |  |  |  |  |  | 5.4 |  |
Eni Espana Comercializadora De Gas SAU |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  |  | 100.00% |  |
Aldro Energa Y Soluciones SLU |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |
Cash consideration |  |  |  |  |  | € 221 |  |  |  |  |  |
Net financial liabilities |  |  |  |  |  | 36 |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 7 |  | € 7 |  |  |  |
Goodwill |  |  |  |  |  | € 168 |  | € 168 |  |  |  |
Number of retail customers | customer |  |  |  |  |  | 250,000 |  |  |  |  |  |
FRI-EL Biogas Holding SpA |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |
Cash consideration |  |  |  |  | € 132 |  |  |  |  |  |  |
Net financial liabilities |  |  |  |  | 14 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 13 |  |  | € 13 |  |  |  |
Goodwill |  |  |  |  | € 80 |  |  | 80 |  |  |  |
Number of plants owned | item |  |  |  |  | 21 |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  |  |  | 2 |  |  |  |  |  |  |
Portfolio Of Thirteen Onshore Wind Facilities |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | € 485 |  |  |  |  |  |  |  |
Net financial liabilities |  |  |  | 215 |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 41 |  |  |  | 41 |  |  |  |
Goodwill |  |  |  | € 302 |  |  |  | 302 |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  |  | 315 |  |  |  |  |  |  |  |
Dhamma Energy Group |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | € 140 |  |  |  |  |  |  |  |  |
Net financial liabilities |  |  | 101 |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 10 |  |  |  |  | 10 |  |  |  |
Goodwill |  |  | € 120 |  |  |  |  | 120 |  |  |  |
Power generating capacity, projected | GW |  |  | 3 |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  | 120 |  |  |  |  |  |  |  |  |
Portfolio Of Nine Renewable Energy Projects |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | € 118 |  |  |  |  |  |  |  |  |  |
Net financial liabilities |  | 32 |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 5 |  |  |  |  |  | 5 |  |  |  |
Goodwill |  | € 81 |  |  |  |  |  | 81 |  |  |  |
Portfolio Of Nine Renewable Energy Projects, wind farms |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  | 234 |  |  |  |  |  |  |  |  |  |
Portfolio Of Nine Renewable Energy Projects, solar projects |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | GW |  | 0.9 |  |  |  |  |  |  |  |  |  |
Finproject SpA |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  | 60.00% |  |  |
Cash consideration |  |  |  |  |  |  |  |  | € 149 |  |  |
Net financial liabilities |  |  |  |  |  |  |  |  | 85 |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | 21 | 21 |  |  |
Fair value of stake already owned |  |  |  |  |  |  |  |  | 99 |  |  |
Goodwill |  |  |  |  |  |  |  | € 93 | € 93 |  |  |
Be Power |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |
Consideration paid | € 764 |  |  |  |  |  |  |  |  |  |  |
Percentage of consideration paid | 50.00% |  |  |  |  |  |  |  |  |  |  |
Net financial liabilities | € (9) |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 24 |  |  |  |  |  |  | € 24 |  |  |  |
Goodwill | € 728 |  |  |  |  |  |  | € 728 |  |  |  |
Number of charging points | 6,000 |  |  |  |  |  |  |  |  |  |  |

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