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Business combinations and other significant transactions - Balance sheet values of the business (Details) - EUR (€) € in Millions | Dec. 31, 2021 | Nov. 02, 2021 | Oct. 28, 2021 | Oct. 22, 2021 | Oct. 04, 2021 | Jul. 29, 2021 | Jun. 03, 2021 | Apr. 07, 2021 | Mar. 10, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € 163 |  |  |  |  |  |  |  |  |  |
Current financial assets | 208 |  |  |  |  |  |  |  |  |  |
Other current assets | 632 |  |  |  |  |  |  |  |  | € 15 | € 1
Current assets | 1,003 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 1,066 |  |  |  |  |  |  |  |  |  |
Goodwill | 1,574 |  |  |  |  |  |  |  |  |  |
Other non-current assets | 436 |  |  |  |  |  |  |  |  |  |
Non-current assets | 3,076 |  |  |  |  |  |  |  |  | 193 | 12
TOTAL ASSETS | 4,079 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 267 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 380 |  |  |  |  |  |  |  |  |  |
Current liabilities | 647 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 718 |  |  |  |  |  |  |  |  |  |
Provisions | 8 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 135 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 246 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 1,107 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 1,754 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 2,321 |  |  |  |  |  |  |  |  |  |
Non-controlling interest | 4 |  |  |  |  |  |  |  |  | € 15 | € 2
TOTAL EQUITY | 2,325 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 4,079 |  |  |  |  |  |  |  |  |  |
Union Fenosa Gas SA |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 42 |  |  |  |  |  |  |  | € 42 |  |
Other current assets | 370 |  |  |  |  |  |  |  |  |  |
Current assets | 412 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 335 |  |  |  |  |  |  |  |  |  |
Goodwill | 2 |  |  |  |  |  |  |  | € 2 |  |
Other non-current assets | 41 |  |  |  |  |  |  |  |  |  |
Non-current assets | 378 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 790 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 35 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 224 |  |  |  |  |  |  |  |  |  |
Current liabilities | 259 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 135 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 15 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 181 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 331 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 590 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 200 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 200 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 790 |  |  |  |  |  |  |  |  |  |
Aldro Energa Y Soluciones SLU |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 7 |  |  |  |  |  |  | € 7 |  |  |
Other current assets | 78 |  |  |  |  |  |  |  |  |  |
Current assets | 85 |  |  |  |  |  |  |  |  |  |
Goodwill | 168 |  |  |  |  |  |  | € 168 |  |  |
Other non-current assets | 69 |  |  |  |  |  |  |  |  |  |
Non-current assets | 237 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 322 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 36 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 37 |  |  |  |  |  |  |  |  |  |
Current liabilities | 73 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 7 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 7 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 14 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 28 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 101 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 221 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 221 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 322 |  |  |  |  |  |  |  |  |  |
FRI-EL Biogas Holding SpA |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 13 |  |  |  |  |  | € 13 |  |  |  |
Other current assets | 23 |  |  |  |  |  |  |  |  |  |
Current assets | 36 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 38 |  |  |  |  |  |  |  |  |  |
Goodwill | 80 |  |  |  |  |  | € 80 |  |  |  |
Other non-current assets | 15 |  |  |  |  |  |  |  |  |  |
Non-current assets | 133 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 169 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 11 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 7 |  |  |  |  |  |  |  |  |  |
Current liabilities | 18 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 16 |  |  |  |  |  |  |  |  |  |
Provisions | 1 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 1 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 18 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 36 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 132 |  |  |  |  |  |  |  |  |  |
Non-controlling interest | 1 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 133 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 169 |  |  |  |  |  |  |  |  |  |
Portfolio Of Thirteen Onshore Wind Facilities |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 41 |  |  |  |  | € 41 |  |  |  |  |
Current financial assets | 150 |  |  |  |  |  |  |  |  |  |
Other current assets | 32 |  |  |  |  |  |  |  |  |  |
Current assets | 223 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 423 |  |  |  |  |  |  |  |  |  |
Goodwill | 302 |  |  |  |  | € 302 |  |  |  |  |
Other non-current assets | 43 |  |  |  |  |  |  |  |  |  |
Non-current assets | 768 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 991 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 79 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 22 |  |  |  |  |  |  |  |  |  |
Current liabilities | 101 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 327 |  |  |  |  |  |  |  |  |  |
Provisions | 4 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 62 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 12 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 405 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 506 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 485 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 485 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 991 |  |  |  |  |  |  |  |  |  |
Dhamma Energy Group |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 10 |  |  |  | € 10 |  |  |  |  |  |
Current financial assets | 29 |  |  |  |  |  |  |  |  |  |
Other current assets | 2 |  |  |  |  |  |  |  |  |  |
Current assets | 41 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 119 |  |  |  |  |  |  |  |  |  |
Goodwill | 120 |  |  |  | € 120 |  |  |  |  |  |
Other non-current assets | 15 |  |  |  |  |  |  |  |  |  |
Non-current assets | 254 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 295 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 4 |  |  |  |  |  |  |  |  |  |
Current liabilities | 4 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 140 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 8 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 148 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 152 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 140 |  |  |  |  |  |  |  |  |  |
Non-controlling interest | 3 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 143 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 295 |  |  |  |  |  |  |  |  |  |
Portfolio Of Nine Renewable Energy Projects |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 5 |  |  | € 5 |  |  |  |  |  |  |
Current financial assets | 6 |  |  |  |  |  |  |  |  |  |
Other current assets | 7 |  |  |  |  |  |  |  |  |  |
Current assets | 18 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 57 |  |  |  |  |  |  |  |  |  |
Goodwill | 81 |  |  | € 81 |  |  |  |  |  |  |
Other non-current assets | 25 |  |  |  |  |  |  |  |  |  |
Non-current assets | 163 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 181 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 4 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 2 |  |  |  |  |  |  |  |  |  |
Current liabilities | 6 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 39 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 8 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 10 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 57 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 63 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 118 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 118 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 181 |  |  |  |  |  |  |  |  |  |
Finproject SpA |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 21 |  | € 21 |  |  |  |  |  |  |  |
Other current assets | 92 |  |  |  |  |  |  |  |  |  |
Current assets | 113 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 35 |  |  |  |  |  |  |  |  |  |
Goodwill | 93 |  | € 93 |  |  |  |  |  |  |  |
Other non-current assets | 205 |  |  |  |  |  |  |  |  |  |
Non-current assets | 333 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 446 |  |  |  |  |  |  |  |  |  |
Current financial liabilities | 102 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 54 |  |  |  |  |  |  |  |  |  |
Current liabilities | 156 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 4 |  |  |  |  |  |  |  |  |  |
Provisions | 1 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 35 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 2 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 42 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 198 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 248 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 248 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 446 |  |  |  |  |  |  |  |  |  |
Be Power |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 24 | € 24 |  |  |  |  |  |  |  |  |
Current financial assets | 23 |  |  |  |  |  |  |  |  |  |
Other current assets | 22 |  |  |  |  |  |  |  |  |  |
Current assets | 69 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 29 |  |  |  |  |  |  |  |  |  |
Goodwill | 728 | € 728 |  |  |  |  |  |  |  |  |
Other non-current assets | 10 |  |  |  |  |  |  |  |  |  |
Non-current assets | 767 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 836 |  |  |  |  |  |  |  |  |  |
Other current liabilities | 30 |  |  |  |  |  |  |  |  |  |
Current liabilities | 30 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 38 |  |  |  |  |  |  |  |  |  |
Provisions | 2 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 2 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 42 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 72 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 764 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 764 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | 836 |  |  |  |  |  |  |  |  |  |
Other Acquisitions And Businesses |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Other current assets | 6 |  |  |  |  |  |  |  |  |  |
Current assets | 6 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 30 |  |  |  |  |  |  |  |  |  |
Other non-current assets | 13 |  |  |  |  |  |  |  |  |  |
Non-current assets | 43 |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS | 49 |  |  |  |  |  |  |  |  |  |
Non-current financial liabilities | 12 |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | 24 |  |  |  |  |  |  |  |  |  |
Non-current liabilities | 36 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES | 36 |  |  |  |  |  |  |  |  |  |
Equity attributable to Eni | 13 |  |  |  |  |  |  |  |  |  |
TOTAL EQUITY | 13 |  |  |  |  |  |  |  |  |  |
TOTAL LIABILITIES AND EQUITY | € 49 |  |  |  |  |  |  |  |  |  |

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