v3.26.1
Other information about investments - Profit and loss and balance sheet related to the principal joint ventures (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about investments        
Non-current assets € 88,202 € 102,937    
Total assets 137,069 146,939    
Non-current liabilities 47,987 53,269    
Total liabilities 84,282 91,291    
Net equity 52,787 55,648 € 53,644 € 55,230
Book value of the investment 13,155 14,150 12,630  
Revenues and other income 83,629 91,214 94,816  
Operating profit (loss) 5,010 5,238 8,257  
Finance income (expense) (819) (599) (473)  
Income (expense) from investments 1,587 1,850 2,444  
Profit (loss) before income taxes 5,778 6,489 10,228  
Income taxes (3,020) (3,725) (5,368)  
Profit 2,758 2,764 4,860  
Other comprehensive income (loss) (5,775) 2,415 (1,551)  
Total other comprehensive income (loss) (3,017) 5,179 3,309  
Profit (loss) attributable to Eni 2,608 2,624 € 4,771  
Azule Energy Holdings Ltd        
Disclosure of detailed information about investments        
Current assets 3,394 3,181    
- of which cash and cash equivalent 507 549    
Non-current assets 21,678 23,042    
Total assets 25,072 26,223    
Current liabilities 4,295 3,505    
- of which current financial liabilities 1,744 1,182    
Non-current liabilities 9,657 9,796    
- of which non-current financial liabilities 4,956 3,297    
Total liabilities 13,952 13,301    
Net equity € 11,120 € 12,922    
Eni's % of the investment 50.00% 50.00%    
Goodwill, Group capital gains and perpetual subordinated bonds € (926) € (1,250)    
Book value of the investment 4,634 5,211    
Revenues and other income 3,917 4,961    
Operating expense (822) (1,261)    
Other operating profit (loss) (47)      
Depreciation, amortization and impairments (2,188) (1,479)    
Operating profit (loss) 860 2,221    
Finance income (expense) (268) (474)    
Income (expense) from investments 289 208    
Profit (loss) before income taxes 881 1,955    
Income taxes (238) (751)    
Profit 643 1,204    
Other comprehensive income (loss) (1,212) 572    
Total other comprehensive income (loss) (569) 1,776    
Profit (loss) attributable to Eni 415 602    
Dividends received from the joint venture 386 427    
St. Bernard Renewables Llc        
Disclosure of detailed information about investments        
Current assets 395 313    
- of which cash and cash equivalent 23 72    
Non-current assets 1,310 1,577    
Total assets 1,705 1,890    
Current liabilities 116 99    
- of which current financial liabilities 116      
Non-current liabilities 309 217    
- of which non-current financial liabilities 308 215    
Total liabilities 425 316    
Net equity € 1,280 € 1,574    
Eni's % of the investment 50.00% 50.00%    
Goodwill, Group capital gains and perpetual subordinated bonds € 17 € 19    
Book value of the investment 657 806    
Revenues and other income 999 1,220    
Operating expense (961) (1,134)    
Other operating profit (loss) (75) (93)    
Depreciation, amortization and impairments (57) (72)    
Operating profit (loss) (94) (79)    
Finance income (expense) 2 (11)    
Income (expense) from investments (24)      
Profit (loss) before income taxes (116) (90)    
Profit (116) (90)    
Other comprehensive income (loss) (182) 99    
Total other comprehensive income (loss) (298) 9    
Profit (loss) attributable to Eni (58) (45)    
E&E Algeria Touat BV        
Disclosure of detailed information about investments        
Current assets 117 130    
- of which cash and cash equivalent 56 55    
Non-current assets 1,224 1,497    
Total assets 1,341 1,627    
Current liabilities 33 54    
Non-current liabilities 291 376    
Total liabilities 324 430    
Net equity € 1,017 € 1,197    
Eni's % of the investment 66.00% 54.00%    
Book value of the investment € 671 € 646    
Revenues and other income 287 290    
Operating expense (90) (98)    
Depreciation, amortization and impairments (88) (105)    
Operating profit (loss) 109 87    
Finance income (expense) (3)      
Profit (loss) before income taxes 106 87    
Income taxes (53) (13)    
Profit 53 74    
Other comprehensive income (loss) (115) 72    
Total other comprehensive income (loss) (62) 146    
Profit (loss) attributable to Eni 35 40    
Saipem SpA        
Disclosure of detailed information about investments        
Current assets 9,122 9,675    
- of which cash and cash equivalent 1,707 2,158    
Non-current assets 5,425 4,844    
Total assets 14,547 14,519    
Current liabilities 8,393 8,564    
- of which current financial liabilities 1,012 796    
Non-current liabilities 3,410 3,431    
- of which non-current financial liabilities 2,094 2,220    
Total liabilities 11,803 11,995    
Net equity € 2,744 € 2,524    
Eni's % of the investment 21.80% 21.61%    
Goodwill, Group capital gains and perpetual subordinated bonds € (17) € (17)    
Book value of the investment 581 528    
Revenues and other income 15,508 14,552    
Operating expense (13,792) (13,224)    
Other operating profit (loss)   1    
Depreciation, amortization and impairments (1,037) (723)    
Operating profit (loss) 679 606    
Finance income (expense) (189) (85)    
Income (expense) from investments 28 (25)    
Profit (loss) before income taxes 518 496    
Income taxes (207) (190)    
Profit 311 306    
Other comprehensive income (loss) 156 (124)    
Total other comprehensive income (loss) 467 182    
Profit (loss) attributable to Eni 71 75    
Dividends received from the joint venture 72      
SeaCorridor Srl        
Disclosure of detailed information about investments        
Current assets 114 134    
- of which cash and cash equivalent 80 89    
Non-current assets 578 580    
Total assets 692 714    
Current liabilities 93 126    
- of which current financial liabilities 29      
Non-current liabilities 140 15    
- of which non-current financial liabilities 123 1    
Total liabilities 233 141    
Net equity € 459 € 573    
Eni's % of the investment 50.10% 50.10%    
Goodwill, Group capital gains and perpetual subordinated bonds € 181 € 198    
Book value of the investment 411 485    
Revenues and other income 343 332    
Operating expense (44) (45)    
Depreciation, amortization and impairments (47) (44)    
Operating profit (loss) 252 243    
Finance income (expense) (1) 6    
Income (expense) from investments 28 29    
Profit (loss) before income taxes 279 278    
Income taxes (214) (189)    
Profit 65 89    
Other comprehensive income (loss) (24) 11    
Total other comprehensive income (loss) 41 100    
Profit (loss) attributable to Eni 32 45    
Dividends received from the joint venture € 95 95    
2023 Sol IX Llc        
Disclosure of detailed information about investments        
Eni's % of the investment 73.62%      
Profit   1    
Other comprehensive income (loss) € (24) 8    
Total other comprehensive income (loss) € (24) 9    
GreenIT SpA        
Disclosure of detailed information about investments        
Eni's % of the investment 51.00%      
Profit € 5 4    
Other comprehensive income (loss) (1) (2)    
Total other comprehensive income (loss) € 4 2    
Mozambique Rovuma Venture SpA        
Disclosure of detailed information about investments        
Eni's % of the investment 35.71%      
Profit € 100 47    
Other comprehensive income (loss) (131) 64    
Total other comprehensive income (loss) € (31) 111    
Cardon IV SA        
Disclosure of detailed information about investments        
Eni's % of the investment 50.00%      
Profit € 125 (18)    
Other comprehensive income (loss) (87) 47    
Total other comprehensive income (loss) € 38 29    
Vårgrønn AS        
Disclosure of detailed information about investments        
Eni's % of the investment 65.00%      
Profit € (54) (57)    
Other comprehensive income (loss) (42) 26    
Total other comprehensive income (loss) € (96) € (31)