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Transactions with related parties (Details) - Transactions and balances - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Transactions With Related Parties      
Receivables and other assets € 2,794 € 1,822 € 1,021
Payables and other liabilities 3,897 3,052 2,575
Guarantees 8,503 2,135 2,443
Revenues 11,028 3,052 1,199
Costs 15,347 8,671 6,637
Other operating (expense) income 3,306 735 13
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 853 536 533
Payables and other liabilities 3,018 2,066 1,818
Guarantees 8,503 2,135 2,443
Revenues 439 380 321
Costs 8,884 4,819 3,448
Other operating (expense) income (597) (409) (121)
Joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 706 402 416
Payables and other liabilities 3,004 2,060 1,794
Guarantees 8,301 1,945 2,267
Revenues 417 359 306
Costs 8,869 4,809 3,439
Other operating (expense) income (597) (409) (121)
Agiba Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 17 13 6
Payables and other liabilities 71 57 52
Costs 224 189 201
Angola LNG Ltd      
Transactions With Related Parties      
Costs 79 73  
Angola LNG Supply Services Llc      
Transactions With Related Parties      
Guarantees   179 165
Coral FLNG SA      
Transactions With Related Parties      
Receivables and other assets 10 17 6
Guarantees 1,378 1,260 1,079
Revenues 12 43 49
Gas Distribution Company of Thessaloniki Thessaly SA      
Transactions With Related Parties      
Payables and other liabilities     13
Costs     52
Azule Group      
Transactions With Related Parties      
Receivables and other assets 320    
Payables and other liabilities 517    
Guarantees 3,268    
Revenues 46    
Costs 1,152    
Saipem Group      
Transactions With Related Parties      
Receivables and other assets 3 4 87
Payables and other liabilities 195 134 254
Guarantees 9 9 509
Revenues 9 28 18
Costs 452 174 350
Vårgrønn Group      
Transactions With Related Parties      
Guarantees 1,259    
Karachaganak Petroleum Operating BV      
Transactions With Related Parties      
Receivables and other assets 27 24 25
Payables and other liabilities 251 213 141
Costs 1,347 989 816
Mellitah Oil & Gas BV      
Transactions With Related Parties      
Receivables and other assets 58 65 54
Payables and other liabilities 144 290 250
Revenues 9 3 2
Costs 234 263 156
Petrobel Belayim Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 33 24 65
Payables and other liabilities 595 391 467
Revenues   2  
Costs 944 651 556
Societe Centrale Electrique du Congo SA      
Transactions With Related Parties      
Receivables and other assets 47 50 48
Revenues 74 66 57
Societa Oleodotti Meridionali SpA      
Transactions With Related Parties      
Receivables and other assets 6 6 3
Payables and other liabilities 433 396 399
Revenues 16 18 20
Costs 14 12 15
Union Fenosa Gas SA      
Transactions With Related Parties      
Receivables and other assets     11
Payables and other liabilities     4
Guarantees     57
Revenues     9
Other operating (expense) income     (3)
Var Energi ASA      
Transactions With Related Parties      
Receivables and other assets 58 62 39
Payables and other liabilities 722 526 190
Guarantees 2,378 495 456
Revenues 84 104 85
Costs 4,085 2,224 1,126
Other operating (expense) income (597) (409) (118)
Other joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 127 137 72
Payables and other liabilities 76 53 24
Guarantees 9 2 1
Revenues 167 95 66
Costs 338 234 167
Investments in unconsolidated entities controlled by Eni      
Transactions With Related Parties      
Receivables and other assets 147 134 117
Payables and other liabilities 14 6 24
Guarantees 202 190 176
Revenues 22 21 15
Costs 15 10 9
Eni BTC Ltd      
Transactions With Related Parties      
Guarantees 190 179 165
Industria Siciliana Acido Fosforico ISAF SPA      
Transactions With Related Parties      
Receivables and other assets 139 124 112
Payables and other liabilities 4 1 1
Guarantees 1 1 1
Revenues 15 13 11
Other unconsolidated subsidiaries      
Transactions With Related Parties      
Receivables and other assets 8 10 5
Payables and other liabilities 10 5 23
Guarantees 11 10 10
Revenues 7 8 4
Costs 15 10 9
Entities controlled by the Government      
Transactions With Related Parties      
Receivables and other assets 1,762 1,116 400
Payables and other liabilities 763 905 701
Revenues 10,555 2,642 857
Costs 6,007 3,597 2,874
Other operating (expense) income 3,903 1,144 134
Cassa Depositi e Prestiti Group      
Transactions With Related Parties      
Receivables and other assets 2    
Payables and other liabilities 47    
Revenues 3    
Costs 86    
Enel Group      
Transactions With Related Parties      
Receivables and other assets 438 583 104
Payables and other liabilities 264 461 165
Revenues 97 41 51
Costs 275 417 551
Other operating (expense) income 484 373 86
Italgas Group      
Transactions With Related Parties      
Receivables and other assets 218 1 1
Payables and other liabilities 8 49 177
Revenues 84 3 3
Costs   560 714
Snam Group      
Transactions With Related Parties      
Receivables and other assets 763 160 189
Payables and other liabilities 25 152 211
Revenues 1,767 159 45
Costs 873 1,013 1,012
Other operating (expense) income   1  
Terna Group      
Transactions With Related Parties      
Receivables and other assets 119 51 46
Payables and other liabilities 159 85 62
Revenues 612 203 152
Costs 701 309 225
Other operating (expense) income (18) 4 8
GSE - Gestore Servizi Energetici      
Transactions With Related Parties      
Receivables and other assets 207 311 52
Payables and other liabilities 225 125 37
Revenues 7,786 2,216 586
Costs 4,039 1,238 309
Other operating (expense) income 3,437 766 40
ITA Airways - Italia Trasporto Aereo SpA      
Transactions With Related Parties      
Receivables and other assets 3    
Revenues 179    
Other entities controlled by government      
Transactions With Related Parties      
Receivables and other assets 12 10 8
Payables and other liabilities 35 33 49
Revenues 27 20 20
Costs 33 60 63
Other related parties      
Transactions With Related Parties      
Receivables and other assets     1
Payables and other liabilities 2 2 4
Revenues 1   2
Costs 39 33 53
Pension funds      
Transactions With Related Parties      
Costs 29    
Fondazione Eni Enrico Mattei      
Transactions With Related Parties      
Costs 5    
Eni Foundation      
Transactions With Related Parties      
Costs 5    
Groupement Sonatrach – Eni «GSE»      
Transactions With Related Parties      
Receivables and other assets 179    
Payables and other liabilities 114    
Revenues 33    
Costs € 417    
Groupement Sonatrach Agip and Organe Conjoint des Operations      
Transactions With Related Parties      
Receivables and other assets   170 87
Payables and other liabilities   79 52
Revenues   30 19
Costs   € 222 € 262