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Transactions with related parties (Details) - Transactions and balances - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Transactions With Related Parties      
Receivables and other assets € 1,563 € 2,794 € 1,822
Payables and other liabilities 4,818 3,897 3,052
Guarantees 8,041 8,503 2,135
Revenues 4,478 11,028 3,052
Costs 15,888 15,347 8,671
Other operating (expense) income 17 3,306 735
Individual amount limit to be included in other related parties 50 50 50
Joint ventures and associates and investments in unconsolidated entities controlled by Eni      
Transactions With Related Parties      
Receivables and other assets 663 853 536
Payables and other liabilities 3,554 3,018 2,066
Guarantees 8,041 8,503 2,135
Revenues 383 439 380
Costs 10,882 8,884 4,819
Other operating (expense) income (165) (597) (409)
Joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 498 706 402
Payables and other liabilities 3,540 3,004 2,060
Guarantees 7,845 8,301 1,945
Revenues 358 417 359
Costs 10,852 8,869 4,809
Other operating (expense) income (165) (597) (409)
Agiba Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 1 17 13
Payables and other liabilities 194 71 57
Costs 308 224 189
Cardon IV SA      
Transactions With Related Parties      
Receivables and other assets 24    
Payables and other liabilities 142    
Revenues 4    
Costs 1    
Angola LNG Ltd      
Transactions With Related Parties      
Costs   79 73
Angola LNG Supply Services Llc      
Transactions With Related Parties      
Guarantees     179
Coral FLNG SA      
Transactions With Related Parties      
Receivables and other assets 4 10 17
Guarantees 1,327 1,378 1,260
Revenues 6 12 43
Azule Group      
Transactions With Related Parties      
Receivables and other assets 113 320  
Payables and other liabilities 475 517  
Guarantees 3,156 3,268  
Revenues 86 46  
Costs 2,146 1,152  
Saipem Group      
Transactions With Related Parties      
Receivables and other assets 5 3 4
Payables and other liabilities 235 195 134
Guarantees 9 9 9
Revenues 6 9 28
Costs 768 452 174
SeaCorridor Group      
Transactions With Related Parties      
Receivables and other assets 29    
Payables and other liabilities 29    
Revenues 1    
Costs 357    
Vårgrønn Group      
Transactions With Related Parties      
Guarantees 1,321 1,259  
Karachaganak Petroleum Operating BV      
Transactions With Related Parties      
Receivables and other assets 17 27 24
Payables and other liabilities 250 251 213
Costs 1,183 1,347 989
Mellitah Oil & Gas BV      
Transactions With Related Parties      
Receivables and other assets 49 58 65
Payables and other liabilities 20 144 290
Revenues 16 9 3
Costs 517 234 263
Petrobel Belayim Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 58 33 24
Payables and other liabilities 885 595 391
Revenues     2
Costs 870 944 651
Societa Oleodotti Meridionali SpA      
Transactions With Related Parties      
Receivables and other assets 11 6 6
Payables and other liabilities 473 433 396
Revenues 19 16 18
Costs 12 14 12
Societe Centrale Electrique du Congo SA      
Transactions With Related Parties      
Receivables and other assets 74 47 50
Revenues 79 74 66
Var Energi ASA      
Transactions With Related Parties      
Receivables and other assets 51 58 62
Payables and other liabilities 764 722 526
Guarantees 2,013 2,378 495
Revenues 58 84 104
Costs 4,487 4,085 2,224
Other operating (expense) income (165) (597) (409)
Other joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 62 127 137
Payables and other liabilities 73 76 53
Guarantees 19 9 2
Revenues 83 167 95
Costs 203 338 234
Investments in unconsolidated entities controlled by Eni      
Transactions With Related Parties      
Receivables and other assets 165 147 134
Payables and other liabilities 14 14 6
Guarantees 196 202 190
Revenues 25 22 21
Costs 30 15 10
Eni BTC Ltd      
Transactions With Related Parties      
Guarantees 183 190 179
Industria Siciliana Acido Fosforico ISAF SPA      
Transactions With Related Parties      
Receivables and other assets 152 139 124
Payables and other liabilities 4 4 1
Guarantees 1 1 1
Revenues 12 15 13
Other unconsolidated subsidiaries      
Transactions With Related Parties      
Receivables and other assets 13 8 10
Payables and other liabilities 10 10 5
Guarantees 12 11 10
Revenues 13 7 8
Costs 30 15 10
Entities controlled by the Government      
Transactions With Related Parties      
Receivables and other assets 677 1,762 1,116
Payables and other liabilities 1,050 763 905
Revenues 4,054 10,555 2,642
Costs 4,401 6,007 3,597
Other operating (expense) income 182 3,903 1,144
Cassa Depositi e Prestiti Group      
Transactions With Related Parties      
Receivables and other assets 5 2  
Payables and other liabilities 33 47  
Revenues 2 3  
Costs 69 86  
Enel Group      
Transactions With Related Parties      
Receivables and other assets 95 438 583
Payables and other liabilities 168 264 461
Revenues 93 97 41
Costs 497 275 417
Other operating (expense) income (109) 484 373
Italgas Group      
Transactions With Related Parties      
Receivables and other assets 1 218 1
Payables and other liabilities 149 8 49
Revenues 8 84 3
Costs (20)   560
Snam Group [Member]      
Transactions With Related Parties      
Receivables and other assets 245 763 160
Payables and other liabilities 352 25 152
Revenues 1,157 1,767 159
Costs 1,625 873 1,013
Other operating (expense) income     1
Terna Group      
Transactions With Related Parties      
Receivables and other assets 85 119 51
Payables and other liabilities 61 159 85
Revenues 400 612 203
Costs 317 701 309
Other operating (expense) income 8 (18) 4
GSE - Gestore Servizi Energetici      
Transactions With Related Parties      
Receivables and other assets 230 207 311
Payables and other liabilities 219 225 125
Revenues 2,104 7,786 2,216
Costs 1,875 4,039 1,238
Other operating (expense) income 283 3,437 766
ITA Airways - Italia Trasporto Aereo SpA      
Transactions With Related Parties      
Receivables and other assets 5 3  
Revenues 238 179  
Other entities controlled by government      
Transactions With Related Parties      
Receivables and other assets 11 12 10
Payables and other liabilities 68 35 33
Revenues 52 27 20
Costs 38 33 60
Other related parties      
Transactions With Related Parties      
Receivables and other assets 1    
Payables and other liabilities 2 2 2
Revenues 1 1  
Costs 36 39 33
Pension funds      
Transactions With Related Parties      
Costs 27    
Fondazione Eni Enrico Mattei      
Transactions With Related Parties      
Costs 5    
Eni Foundation      
Transactions With Related Parties      
Costs 4    
Groupement Sonatrach – Eni «GSE»      
Transactions With Related Parties      
Receivables and other assets 222 179  
Payables and other liabilities 212 114  
Revenues 40 33  
Costs € 569 € 417  
Groupement Sonatrach Agip and Organe Conjoint des Operations      
Transactions With Related Parties      
Receivables and other assets     170
Payables and other liabilities     79
Revenues     30
Costs     € 222