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Transactions with related parties (Details) - Transactions and balances - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Transactions With Related Parties      
Receivables and other assets € 1,021 € 1,104 € 864
Payables and other liabilities 2,575 2,841 3,750
Guarantees 2,443 2,596 2,588
Revenues 1,199 1,252 1,391
Costs 6,637 9,173 8,005
Other operating (expense) income 13 19 319
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 533 485 329
Payables and other liabilities 1,818 2,009 2,872
Guarantees 2,443 2,596 2,588
Revenues 321 305 353
Costs 3,448 5,466 4,526
Other operating (expense) income (121) (1) 11
Joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 416 379 236
Payables and other liabilities 1,794 1,983 2,848
Guarantees 2,267 2,399 2,392
Revenues 306 285 335
Costs 3,439 5,448 4,513
Other operating (expense) income (121) (1) 11
Agiba Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 6 3 1
Payables and other liabilities 52 71 96
Costs 201 229 156
Angola LNG Supply Services Llc      
Transactions With Related Parties      
Guarantees 165 181 177
Coral FLNG SA      
Transactions With Related Parties      
Receivables and other assets 6 15 14
Guarantees 1,079 1,168 1,147
Revenues 49 71 62
Gas Distribution Company of Thessaloniki Thessaly SA      
Transactions With Related Parties      
Receivables and other assets     1
Payables and other liabilities 13 13 18
Costs 52 53 51
Saipem Group      
Transactions With Related Parties      
Receivables and other assets 87 75 75
Payables and other liabilities 254 227 171
Guarantees 509 510 793
Revenues 18 27 30
Costs 350 503 420
Karachaganak Petroleum Operating BV      
Transactions With Related Parties      
Receivables and other assets 25 33 27
Payables and other liabilities 141 198 134
Revenues   1 1
Costs 816 1,134 998
Mellitah Oil & Gas BV      
Transactions With Related Parties      
Receivables and other assets 54 57 1
Payables and other liabilities 250 171 268
Revenues 2 3 1
Costs 156 365 502
Petrobel Belayim Petroleum Co      
Transactions With Related Parties      
Receivables and other assets 65 50 56
Payables and other liabilities 467 1,130 2,029
Revenues   7 7
Costs 556 1,590 2,282
Societa Oleodotti Meridionali SpA      
Transactions With Related Parties      
Receivables and other assets 3    
Payables and other liabilities 399    
Revenues 20    
Costs 15    
Societe Centrale Electrique du Congo SA      
Transactions With Related Parties      
Receivables and other assets 48    
Revenues 57    
Union Fenosa Gas SA      
Transactions With Related Parties      
Receivables and other assets 11 8 4
Payables and other liabilities 4 1 7
Guarantees 57 57 57
Revenues 9 1 123
Costs   6  
Other operating (expense) income (3) 63 37
Var Energi AS      
Transactions With Related Parties      
Receivables and other assets 39 32 13
Payables and other liabilities 190 143 100
Guarantees 456 482 218
Revenues 85 63  
Costs 1,126 1,481  
Other operating (expense) income (118) (64)  
Other joint ventures and associates      
Transactions With Related Parties      
Receivables and other assets 72 106 44
Payables and other liabilities 24 29 25
Guarantees 1 1  
Revenues 66 112 111
Costs 167 87 104
Other operating (expense) income     (26)
Investments in unconsolidated entities controlled by Eni      
Transactions With Related Parties      
Receivables and other assets 117 106 93
Payables and other liabilities 24 26 24
Guarantees 176 197 196
Revenues 15 20 18
Costs 9 18 13
Eni BTC Ltd      
Transactions With Related Parties      
Guarantees 165 180 177
Industria Siciliana Acido Fosforico ISAF SPA      
Transactions With Related Parties      
Receivables and other assets 112 101 87
Payables and other liabilities 1 1 1
Guarantees 1 3 5
Revenues 11 14 11
Other unconsolidated subsidiaries      
Transactions With Related Parties      
Receivables and other assets 5 5 6
Payables and other liabilities 23 25 23
Guarantees 10 14 14
Revenues 4 6 7
Costs 9 18 13
Entities controlled by the Government      
Transactions With Related Parties      
Receivables and other assets 400 542 494
Payables and other liabilities 701 755 736
Revenues 857 909 1,000
Costs 2,874 3,213 3,218
Other operating (expense) income 134 20 308
Enel Group      
Transactions With Related Parties      
Receivables and other assets 104 185 134
Payables and other liabilities 165 284 151
Revenues 51 105 118
Costs 551 602 514
Other operating (expense) income 86 (8) 227
Italgas Group      
Transactions With Related Parties      
Receivables and other assets 1 3 5
Payables and other liabilities 177 154 146
Revenues 3 1 23
Costs 714 677 667
Snam Group      
Transactions With Related Parties      
Receivables and other assets 189 278 237
Payables and other liabilities 211 229 289
Revenues 45 71 109
Costs 1,012 1,208 1,184
Other operating (expense) income     (1)
Terna Group      
Transactions With Related Parties      
Receivables and other assets 46 40 26
Payables and other liabilities 62 45 47
Revenues 152 171 150
Costs 225 223 231
Other operating (expense) income 8 17 8
GSE Gestore Servizi Energetic      
Transactions With Related Parties      
Receivables and other assets 52 26 67
Payables and other liabilities 37 24 85
Revenues 586 549 555
Costs 309 468 588
Other operating (expense) income 40 11 74
Other entities controlled by government      
Transactions With Related Parties      
Receivables and other assets 8 10 25
Payables and other liabilities 49 19 18
Revenues 20 12 45
Costs 63 35 34
Other related parties      
Transactions With Related Parties      
Receivables and other assets 1 2 1
Payables and other liabilities 4 3 2
Revenues 2 5 4
Costs 53 37 32
Pension funds      
Transactions With Related Parties      
Costs 40    
Fondazione Eni Enrico Mattei      
Transactions With Related Parties      
Costs 5    
Eni Foundation      
Transactions With Related Parties      
Costs 1    
Groupement Sonatrach Agip and Organe Conjoint des Operations      
Transactions With Related Parties      
Receivables and other assets 87 75 40
Payables and other liabilities 52 74 140
Revenues 19 33 34
Costs € 262 € 457 € 229