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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about investments        
Non-current assets € 90,269 € 79,888    
Total assets 152,130 137,765    
Non-current liabilities 48,075 49,970    
Total liabilities 96,900 93,246    
Net equity 55,230 44,519 € 37,493 € 47,900
Book value of the investment 12,092 5,887 6,749  
Revenues and other income 133,687 77,771 44,947  
Operating profit (loss) 17,510 12,341 (3,275)  
Finance income (expense) (925) (788) (1,045)  
Income (expense) from investments 5,464 (868) (1,658)  
Profit (loss) before income taxes 22,049 10,685 (5,978)  
Income taxes (8,088) (4,845) (2,650)  
Profit (loss) 13,961 5,840 (8,628)  
Other comprehensive income (loss) 1,757 2,051 (2,780)  
Total other comprehensive income (loss) 15,718 7,891 (11,408)  
Profit (loss) attributable to Eni 13,887 5,821 € (8,635)  
Azule Energy Holdings Ltd        
Disclosure of detailed information about investments        
Current assets 3,869      
- of which cash and cash equivalent 966      
Non-current assets 21,281      
Total assets 25,150      
Current liabilities 2,635      
- current financial liabilities 159      
Non-current liabilities 12,369      
- non-current financial liabilities 4,403      
Total liabilities 15,004      
Net equity € 10,146      
Eni's % of the investment 50.00%      
Book value of the investment € 5,073      
Revenues and other income 2,422      
Operating expense (956)      
Depreciation, amortization and impairments (1,099)      
Operating profit (loss) 367      
Finance income (expense) (142)      
Income (expense) from investments 718      
Profit (loss) before income taxes 943      
Income taxes (33)      
Profit (loss) 910      
Other comprehensive income (loss) (516)      
Total other comprehensive income (loss) 394      
Profit (loss) attributable to Eni 455      
Dividends received from the joint venture 475      
Cardon IV SA        
Disclosure of detailed information about investments        
Current assets 425 285    
- of which cash and cash equivalent 7 3    
Non-current assets 1,812 1,947    
Total assets 2,237 2,232    
Current liabilities 431 373    
- current financial liabilities 3 4    
Non-current liabilities 940 1,301    
- non-current financial liabilities 43 430    
Total liabilities 1,371 1,674    
Net equity € 866 € 558    
Eni's % of the investment 50.00% 50.00%    
Book value of the investment € 433 € 279    
Revenues and other income 942 686    
Operating expense (679) (546)    
Depreciation, amortization and impairments (127) (98)    
Operating profit (loss) 136 42    
Finance income (expense)   (67)    
Profit (loss) before income taxes 136 (25)    
Income taxes (122) (131)    
Profit (loss) 14 (156)    
Other comprehensive income (loss) 30 39    
Total other comprehensive income (loss) 44 (117)    
Profit (loss) attributable to Eni € 7 (78)    
Doggerbank Offshore Wind Farm Project 1 Holdco Ltd        
Disclosure of detailed information about investments        
Profit (loss)   (1)    
Other comprehensive income (loss)   31    
Total other comprehensive income (loss)   30    
Doggerbank Offshore Wind Farm Project 2 Holdco Ltd        
Disclosure of detailed information about investments        
Profit (loss)   (1)    
Other comprehensive income (loss)   (9)    
Total other comprehensive income (loss)   (10)    
Mozambique Rovuma Venture SpA        
Disclosure of detailed information about investments        
Eni's % of the investment 35.71%      
Profit (loss) € (202)      
Other comprehensive income (loss) 72      
Total other comprehensive income (loss) (130)      
Saipem SpA        
Disclosure of detailed information about investments        
Current assets 7,627 6,819    
- of which cash and cash equivalent 2,052 1,632    
Non-current assets 4,770 4,723    
Total assets 12,397 11,542    
Current liabilities 6,932 6,844    
- current financial liabilities 1,040 1,256    
Non-current liabilities 3,352 4,347    
- non-current financial liabilities 1,993 2,679    
Total liabilities 10,284 11,191    
Net equity € 2,113 € 351    
Eni's % of the investment 31.20% 31.20%    
Book value of the investment € 645 € 137    
Revenues and other income 9,991 6,880    
Operating expense (9,455) (8,532)    
Other operating profit (loss) 7 2    
Depreciation, amortization and impairments (445) (616)    
Operating profit (loss) 98 (2,266)    
Finance income (expense) (195) (140)    
Income (expense) from investments (65) 9    
Profit (loss) before income taxes (162) (2,397)    
Income taxes (153) (70)    
Profit (loss) - discontinued operations 106      
Profit (loss) (209) (2,467)    
Other comprehensive income (loss) 24 (117)    
Total other comprehensive income (loss) (185) (2,584)    
Profit (loss) attributable to Eni € (82) (752)    
Vårgrønn AS        
Disclosure of detailed information about investments        
Eni's % of the investment 65.00%      
Profit (loss) € (17)      
Other comprehensive income (loss) (7)      
Total other comprehensive income (loss) (24)      
Var Energi ASA        
Disclosure of detailed information about investments        
Current assets   1,382    
- of which cash and cash equivalent   198    
Non-current assets   16,589    
Total assets   17,971    
Current liabilities   2,148    
- current financial liabilities   390    
Non-current liabilities   14,900    
- non-current financial liabilities   4,160    
Total liabilities   17,048    
Net equity   € 923    
Eni's % of the investment   69.85%    
Book value of the investment   € 645    
Revenues and other income   5,191    
Operating expense   (1,207)    
Other operating profit (loss)   (51)    
Depreciation, amortization and impairments   (1,825)    
Operating profit (loss)   2,108    
Finance income (expense)   (350)    
Profit (loss) before income taxes   1,758    
Income taxes   (1,729)    
Profit (loss)   29    
Other comprehensive income (loss)   61    
Total other comprehensive income (loss)   90    
Profit (loss) attributable to Eni   20    
Dividends received from the joint venture   561    
Other joint ventures        
Disclosure of detailed information about investments        
Current assets 741 868    
- of which cash and cash equivalent 219 199    
Non-current assets 13,639 7,765    
Total assets 14,380 8,633    
Current liabilities 1,764 1,169    
- current financial liabilities 1,278 300    
Non-current liabilities 10,740 5,682    
- non-current financial liabilities 10,146 5,167    
Total liabilities 12,504 6,851    
Net equity 1,876 1,782    
Book value of the investment 915 996    
Revenues and other income 526 341    
Operating expense (463) (315)    
Other operating profit (loss) 25 4    
Depreciation, amortization and impairments (258) (39)    
Operating profit (loss) (170) (9)    
Finance income (expense) (167) (24)    
Income (expense) from investments (4)      
Profit (loss) before income taxes (341) (33)    
Income taxes 62 (3)    
Profit (loss) (279) (36)    
Other comprehensive income (loss) 119 27    
Total other comprehensive income (loss) (160) (9)    
Profit (loss) attributable to Eni 7 (97)    
Dividends received from the joint venture € 8 € 25