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Business combinations and other significant transactions - Acquisitions - Additional Information (Details) € in Millions |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Dec. 30, 2023 NUMBER GW | Dec. 13, 2023 EUR (€) NUMBER MW | Oct. 23, 2023 EUR (€) MW | Oct. 18, 2023 EUR (€) | Oct. 05, 2023 EUR (€) NUMBER MW | Oct. 02, 2023 EUR (€) | Jun. 21, 2023 EUR (€) NUMBER MW | May 11, 2023 EUR (€) NUMBER MW | Feb. 28, 2023 EUR (€) NUMBER | Feb. 09, 2023 EUR (€) MW | Jan. 30, 2023 EUR (€) MW | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  |  |  |  | € 1,432 | € 1,667 |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 155 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 25 | 482 | € 1,574
Net financial liabilities |  |  |  |  |  |  |  |  |  |  |  | 91 |  |
Fair value of investments held before the acquisition of control |  |  |  |  |  |  |  |  |  |  |  | € (271) | (21) |
Kellam photovoltaic plant | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  |  |  |  |  |  |  |  |  | 81 |  |  |
Consideration |  |  |  |  |  |  |  |  |  |  | € 37 |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Net financial liabilities |  |  |  |  |  |  |  |  |  |  | € 2 |  |  |
Maristella Directorship SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  |  | € 5 |  |  |  |
Maristella Directorship SLU | Plenitude business line | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  |  |  |  |  |  |  |  | 90 |  |  |  |
Wind Hero SLU and Wind Grower SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | € 8 |  |  |  |  |  |
Number of companies acquired | NUMBER |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of solar energy projects to be constructed | NUMBER |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Wind Hero SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Wind Grower SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
HLS Bonete PV SLU and HLS Bonete Topco SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  | € 118 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | € 22 |  |  |  |  |  |  |
Number of companies acquired | NUMBER |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of photovoltaic plants owned | NUMBER |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | € 6 |  |  |  |  |  |  |
HLS Bonete PV SLU and HLS Bonete Topco SLU | Plenitude business line | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  |  |  |  |  |  | 96 |  |  |  |  |  |  |
Boceto Solar SLU, Cornisa Solar SLU e Ladronera Solar SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  | € 25 |  |  |  |  |  |  |  |  |
Number of companies acquired | NUMBER |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  |  |  |  | 150 |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | € 4
Renopool 1 SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  | € 100 |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | € 6 |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  |  | 330 |  |  |  |  |  |  |  |  |  |  |
Net financial liabilities |  |  | € 20 |  |  |  |  |  |  |  |  |  |  |
Armadura Solar SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | MW |  | 250 |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  | € 19 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | € 24 |  |  |  |  |  |  |  |  |  |  |  |
Almazara Solar SLU, Atlante Solar SLU, Chapitel Solar SLU, Fortaleza Solar SLU and Garita Solar SLU | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of companies acquired | NUMBER |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, projected | MW |  | 230 |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  | € 21 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | € 26 |  |  |  |  |  |  |  |  |  |  |  |
EDP Renováveis SA (“EDPR”) | Eni New Energy US Inc | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity, existing or in advanced development | GW | 0.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of photovoltaic plants owned | NUMBER | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of businesses acquired | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |
BP business | Algeria | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  | € 476 |  |  |  |  |
Number of gas-producing concessions acquired | NUMBER |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Unproved Property plant and equipment |  |  |  |  |  |  |  |  | € 40 |  |  |  |  |
Proved property plant and equipment |  |  |  |  |  |  |  |  | € 508 |  |  |  |  |
Chevron and operatorship in Ganal PSC and Rapak PSC and Makassar Straits PSC | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  | € 188 |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 122 |  |  |  |  |  |  |  |
Net financial liabilities |  |  |  |  |  | 120 |  |  |  |  |  |  |  |
Unproved Property plant and equipment |  |  |  |  |  | 91 |  |  |  |  |  |  |  |
Proved property plant and equipment |  |  |  |  |  | € 13 |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Ganal PSC | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  | 62.00% |  |  |  |  |  |  |  |
Rapak PSC | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  | 62.00% |  |  |  |  |  |  |  |
Makassar Straits PSC | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  | 72.00% |  |  |  |  |  |  |  |
Novamont group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  |  |  |  |  |  |  |  |  | 36.00% |  |
Novamont group | Chemicals business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  | € 404 |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 19 |  |  |  |  |  |  |  |  |  |
Net financial liabilities |  |  |  | € 207 |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  | 64.00% |  |  |  |  |  |  |  |  |  |
Fair value of investments held before the acquisition of control |  |  |  | € (227) |  |  |  |  |  |  |  |  |  |
Novamont group | Versalis SpA | Chemicals business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  | 36.00% |  |  |  |  |  |  |  |  |  |
Other Acquisitions And Businesses | Plenitude business line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  |  |  |  |  | € 21 |

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