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Other information about investments (Details 13) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about investments [line items]        
Current assets € 39,450 € 36,433    
- of which cash and cash equivalent 698      
Non-current assets 78,628 78,172    
Total assets 118,373 114,928    
Current liabilities 28,382 24,735    
Non-current liabilities 38,859 42,027    
- non-current financial liabilities 1,328      
Total liabilities 67,300 66,849    
Net equity € 51,073 48,079 € 53,086 € 57,409
Eni's ownership interest (%) 13.60%      
Book value of the investment € 7,044 3,511 4,040  
Revenues and other operating income 1,919      
Operating expense (872)      
Operating profit 9,983 8,012 2,157  
Finance (expense) income (971) (1,236) (885)  
Income (expense) from investments 1,095 68 (380)  
Profit before income taxes 10,107 6,844 892  
Income taxes 5,970 3,467 1,936  
Net profit 4,137 3,377 (1,457)  
Other comprehensive income 1,576 (5,518) 1,870  
Total other comprehensive income 5,713 (2,141) € 413  
Net profit attributable to Eni 4,126 3,374    
Angola LNG Ltd [Member]        
Disclosure of detailed information about investments [line items]        
Current assets   662    
- of which cash and cash equivalent   370    
Non-current assets   7,048    
Total assets   7,710    
Current liabilities   203    
Non-current liabilities   1,610    
- non-current financial liabilities   1,418    
Total liabilities   1,813    
Net equity   € 5,897    
Eni's ownership interest (%)   13.60%    
Book value of the investment 95 € 802    
Revenues and other operating income   1,374    
Operating expense   (563)    
Depreciation, depletion, amortization and impairments 1,647 (399)    
Operating profit   412    
Finance (expense) income   (80)    
Profit before income taxes   332    
Net profit   332    
Other comprehensive income   (817)    
Total other comprehensive income   (485)    
Net profit attributable to Eni   45    
United Gas Derivatives Co [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 109 36    
- of which cash and cash equivalent 109 19    
Non-current assets 2,434 1,261    
Total assets 2,543 1,297    
Current liabilities 117 155    
Non-current liabilities 2,018 926    
- non-current financial liabilities 2,016 926    
Total liabilities 2,135 1,081    
Net equity € 408 € 216    
Eni's ownership interest (%) 25.00% 25.00%    
Book value of the investment € 102 € 54    
Operating expense (1)      
Operating profit (1)      
Finance (expense) income (11) 4    
Profit before income taxes (12) 4    
Net profit (12) 4    
Other comprehensive income 16 (13)    
Total other comprehensive income 4 (9)    
Net profit attributable to Eni (3) 1    
Other associates [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 926 338    
- of which cash and cash equivalent 178 89    
Non-current assets 2,296 528    
Total assets 3,222 866    
Current liabilities 785 220    
- current financial liabilities 134 42    
Non-current liabilities 1,755 124    
- non-current financial liabilities 1,473 71    
Total liabilities 2,540 344    
Net equity 682 522    
Book value of the investment 241 205    
Revenues and other operating income 1,053 574    
Operating expense (887) (454)    
Depreciation, depletion, amortization and impairments (58) (40)    
Operating profit 108 80    
Finance (expense) income (1) 3    
Income (expense) from investments 16 (30)    
Profit before income taxes 123 53    
Income taxes (26) (19)    
Net profit 97 34    
Other comprehensive income 17 (39)    
Total other comprehensive income 114 (5)    
Net profit attributable to Eni 25 8    
Dividends received from the associate € 25 € 13