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Business combinations and other significant transactions - Divestments - Additional Information (Details) € in Millions |  |  |  | 12 Months Ended
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Dec. 29, 2022 EUR (€) Number | Oct. 14, 2022 EUR (€) | Oct. 14, 2022 EUR (€) | Oct. 14, 2022 EUR (€) GW | Oct. 14, 2022 EUR (€) MW | Oct. 14, 2022 EUR (€) Number | Aug. 01, 2022 EUR (€) Number | Dec. 31, 2022 EUR (€)
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | € 10
Acquisition of interests in joint ventures |  |  |  |  |  |  |  | 5,726
Net financial liabilities |  |  |  |  |  |  |  | 2,085
Cash and cash equivalents |  |  |  |  |  |  |  | 70
Acquisition-date fair value of equity interest in acquiree |  |  |  |  |  |  |  | 21
Azule Energy Holdings Ltd |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Net financial liabilities |  |  |  |  |  |  | € 1,756 |
Cash and cash equivalents |  |  |  |  |  |  | € 35 |
Proportion of ownership interest in joint venture (as a percent) |  |  |  |  |  |  | 50.00% |
Proportion of ownership interest acquired (as a percent) |  |  |  |  |  |  | 50.00% |
Net assets and liabilities derecognized |  |  |  |  |  |  | € 5,183 |
Recognition of the investment in joint venture |  |  |  |  |  |  | 5,352 |
Recognition of a receivable for the investing loans made to the former subsidiaries |  |  |  |  |  |  | 1,609 |
Realized exchange differences on translation from the business combination |  |  |  |  |  |  | 764 |
Acquisition-date fair value of equity interest in acquiree |  |  |  |  |  |  | 7,130 |
Capital gains from the fair value measurement of the business combination |  |  |  |  |  |  | 3,556 |
Deferred gain on disposal of investment as of disposal date |  |  |  |  |  |  | € 1,778 |
Percentage of gain on disposal of investment |  |  |  |  |  |  | 50.00% |
Repayment of loan by joint venture |  |  |  |  |  |  |  | € 1,310
Azule Energy Holdings Ltd | Angola |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Number of partners in oil and gas operation | Number |  |  |  |  |  |  | 2 |
Azule Energy Holdings Ltd | Be Power SpA |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  |  |  |  | 50.00% |
Vårgrønn AS |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  | 65.00% |  |  |  |  |  |
Vårgrønn AS | Eni North Sea Wind Ltd |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Net assets and liabilities derecognized |  | € 368 | € 368 | € 368 | € 368 | € 368 |  |
Net financial liabilities |  | € 363 | 363 | € 363 | € 363 | € 363 |  |
Recognition of the investment in joint venture |  |  | 374 |  |  |  |  |
Capital gain from assets disposed |  |  | 74 |  |  |  |  |
Realized exchange differences on translation from the business combination |  |  | (33) |  |  |  |  |
Equity interest disposed (as a percent) |  | 100.00% |  |  |  |  |  |
Reversal to the income statement of the effects recognized in the comprehensive income reserves |  |  | € 68 |  |  |  |  |
Vårgrønn AS | Eni North Sea Wind Ltd | UK Dogger Bank A, B and C projects |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Proportion of ownership interest acquired (as a percent) |  | 20.00% |  |  |  |  |  |
Number of phases of the project | Number |  |  |  |  |  | 3 |  |
Power generating capacity, existing or in advanced development |  |  |  | 3.6 | 720 |  |  |
Prime International Oil & Gas Company | Assets in Pakistan |  |  |  |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |  |  |  |
Cash and cash equivalents | € 28 |  |  |  |  |  |  |
Number of oil and gas development and production licenses | Number | 8 |  |  |  |  |  |  |
Number of exploration blocks licences | Number | 4 |  |  |  |  |  |  |
Net assets and liabilities derecognized | € 1 |  |  |  |  |  |  |
Net financial liabilities | 27 |  |  |  |  |  |  |
Realized exchange differences on translation from the business combination | € 86 |  |  |  |  |  |  |

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