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Investments - Net carrying amount (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments      
Net carrying amount € 9,035 € 7,044 € 3,511
Individual amount limit to be included in other equity-accounted investments 25    
Associates      
Investments      
Net carrying amount 4,357 1,452  
Associates | Abu Dhabi Oil Refining Co      
Investments      
Net carrying amount € 2,829    
% of the investment 20.00%    
Associates | Angola LNG Ltd      
Investments      
Net carrying amount € 1,159 € 1,106  
% of the investment 13.60% 13.60%  
Associates | Coral FLNG SA      
Investments      
Net carrying amount € 102 € 102  
% of the investment 25.00% 25.00%  
Associates | Novamont SpA      
Investments      
Net carrying amount € 71 € 67  
% of the investment 25.00% 25.00%  
Associates | United Gas Derivatives Co      
Investments      
Net carrying amount € 69 € 62  
% of the investment 33.33% 33.33%  
Associates | Commonwealth Fusion Systems Llc      
Investments      
Net carrying amount € 37 € 42  
Associates | Other investments      
Investments      
Net carrying amount 90 73  
Joint ventures      
Investments      
Net carrying amount 4,592 5,497  
Joint ventures | Var Energi AS      
Investments      
Net carrying amount € 2,518 € 3,498  
% of the investment 69.60% 69.60%  
Joint ventures | Saipem SpA      
Investments      
Net carrying amount € 1,250 € 1,228  
% of the investment 30.99% 30.99%  
Joint ventures | Union Fenosa Gas SA      
Investments      
Net carrying amount € 326 € 335  
% of the investment 50.00% 50.00%  
Joint ventures | Cardon IV SA      
Investments      
Net carrying amount € 148 € 98  
% of the investment 50.00% 50.00%  
Joint ventures | Gas Distribution Company of Thessaloniki Thessaly SA      
Investments      
Net carrying amount € 139 € 137  
% of the investment 49.00% 49.00%  
Joint ventures | Lotte Versalis Elastomers Co Ltd      
Investments      
Net carrying amount € 74 € 75  
% of the investment 50.00% 50.00%  
Joint ventures | Petro Junin SA      
Investments      
Net carrying amount € 53 € 47  
% of the investment 40.00% 40.00%  
Joint ventures | AET Raffineriebeteiligungs gesellschaft mbH      
Investments      
Net carrying amount € 35 € 32  
% of the investment 33.33% 33.33%  
Joint ventures | Other investments      
Investments      
Net carrying amount € 49 € 47  
Investments in unconsolidated entities controlled by Eni      
Investments      
Net carrying amount 86 95  
Investments in unconsolidated entities controlled by Eni | Eni BTC Ltd      
Investments      
Net carrying amount € 30 € 31  
% of the investment 100.00% 100.00%  
Investments in unconsolidated entities controlled by Eni | Other investments      
Investments      
Net carrying amount € 56 € 64