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Transactions with related parties - Financing transactions with related parties (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Transactions With Related Parties      
Finance incomes and derivative financial instruments € 8,450 € 3,723 € 3,531
Finance expenses 9,333 4,216 4,958
Gain on disposals 3,623 223 75
Financing transactions      
Transactions With Related Parties      
Receivables and cash and cash equivalents 1,657 1,700 807
Payables 432 277 218
Guarantees 1,501 1,413 1,533
Finance incomes and derivative financial instruments 162 79 114
Finance expenses 164 46 26
Gain on disposals 30    
Individual amount limit to be included in other related parties 50 50  
Financing transactions | Joint ventures and associates      
Transactions With Related Parties      
Receivables and cash and cash equivalents 1,639 1,660 771
Payables 185 117 179
Guarantees 1,501 1,413 1,533
Finance incomes and derivative financial instruments 156 78 113
Finance expenses 159 44 25
Financing transactions | Angola LNG Ltd      
Transactions With Related Parties      
Guarantees     228
Financing transactions | Cardon IV SA      
Transactions With Related Parties      
Receivables and cash and cash equivalents   199 383
Payables   2  
Finance incomes and derivative financial instruments   37 57
Financing transactions | Coral FLNG SA      
Transactions With Related Parties      
Receivables and cash and cash equivalents 356 383 288
Finance incomes and derivative financial instruments   4 22
Finance expenses 140 1 1
Financing transactions | Coral South FLNG DMCC      
Transactions With Related Parties      
Guarantees 1,499 1,413 1,304
Finance incomes and derivative financial instruments 1 2  
Finance expenses 1    
Financing transactions | Mozambique Rovuma Venture SpA      
Transactions With Related Parties      
Receivables and cash and cash equivalents 1,187 1,008  
Payables 57 72  
Finance incomes and derivative financial instruments 48    
Finance expenses 5    
Financing transactions | Saipem Group      
Transactions With Related Parties      
Receivables and cash and cash equivalents     2
Payables 100   167
Finance incomes and derivative financial instruments 16    
Finance expenses 3   6
Financing transactions | Societe Centrale Electrique du Congo SA      
Transactions With Related Parties      
Receivables and cash and cash equivalents     83
Finance incomes and derivative financial instruments     7
Financing transactions | Other joint ventures and associates      
Transactions With Related Parties      
Receivables and cash and cash equivalents 96 70 15
Payables 28 43 12
Guarantees 2   1
Finance incomes and derivative financial instruments 91 35 27
Finance expenses 10 43 18
Financing transactions | Investments in unconsolidated entities controlled by Eni      
Transactions With Related Parties      
Receivables and cash and cash equivalents 8 38 36
Payables 31 34 28
Finance incomes and derivative financial instruments 5 1 1
Finance expenses 4 1  
Financing transactions | Other unconsolidated subsidiaries      
Transactions With Related Parties      
Receivables and cash and cash equivalents 8 38 36
Payables 31 34 28
Finance incomes and derivative financial instruments 5 1 1
Finance expenses 4 1  
Financing transactions | Entities controlled by the Government      
Transactions With Related Parties      
Receivables and cash and cash equivalents 10 2  
Payables 216 126 11
Finance incomes and derivative financial instruments 1    
Finance expenses 1 1 1
Gain on disposals 30    
Financing transactions | Enel Group      
Transactions With Related Parties      
Payables 176 109  
Financing transactions | Italgas Group      
Transactions With Related Parties      
Gain on disposals 30    
Financing transactions | Other entities controlled by government      
Transactions With Related Parties      
Receivables and cash and cash equivalents 10 2  
Payables 40 17 11
Finance incomes and derivative financial instruments 1    
Finance expenses € 1 € 1 € 1