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Other information about investments (Details 18) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of subsidiaries [line items]        
Current assets € 36,433 € 37,971    
Non-current assets 78,172 86,560    
Total assets 114,928 124,545    
Current liabilities 24,735 27,696    
Non-current liabilities 42,027 43,763    
Total liabilities 66,849 71,459    
Net equity 48,079 53,086 € 57,409 € 65,641
Operating profit 8,012 2,157 (3,076)  
Finance (expense) income (1,236) (885) (1,306)  
Profit before income taxes 6,844 892 (4,277)  
Income taxes 3,467 1,936 3,122  
Net profit 3,377 (1,457) (9,373)  
Other comprehensive income (5,518) 1,870 4,649  
Total other comprehensive income (2,141) 413 € (4,724)  
Net profit attributable to Eni 3,374 (1,464)    
Angola LNG Ltd [Member]        
Disclosure of subsidiaries [line items]        
Current assets 662 507    
- of which cash and cash equivalent 370 339    
Non-current assets 7,048 8,376    
Total assets 7,710 8,883    
Current liabilities 203 284    
Non-current liabilities 1,610 1,863    
- non-current financial liabilities 1,418 1,699    
Total liabilities 1,813 2,147    
Net equity € 5,897 € 6,736    
Eni’s ownership interest (%) 13.60% 13.60%    
Book value of the investment € 802 € 916    
Revenues and other operating income 1,374 84    
Operating expense (563) (281)    
Depreciation, depletion, amortization and impairments (399)      
Operating profit 412 (188)    
Finance (expense) income (80) (385)    
Income (expense) from investments   (70)    
Profit before income taxes 332 (455)    
Net profit 332 (455)    
Other comprehensive income (817) 200    
Total other comprehensive income (485) (255)    
Net profit attributable to Eni 45 (62)    
United Gas Derivatives Co [Member]        
Disclosure of subsidiaries [line items]        
Current assets 192 253    
- of which cash and cash equivalent 62 146    
Non-current assets 91 140    
Total assets 283 393    
Current liabilities 37 41    
Non-current liabilities   1    
Total liabilities 37 42    
Net equity € 246 € 351    
Eni’s ownership interest (%) 33.33% 33.33%    
Book value of the investment € 82 € 117    
Revenues and other operating income 112 102    
Operating expense (44) (61)    
Depreciation, depletion, amortization and impairments (13)      
Operating profit 55 (13)    
Finance (expense) income 6 28    
Income (expense) from investments   11    
Profit before income taxes 61 39    
Income taxes (14) 5    
Net profit 47 44    
Other comprehensive income (39) 11    
Total other comprehensive income 8 55    
Net profit attributable to Eni 16 14    
Dividends received by the associate 12 14    
Other Associates [Member]        
Disclosure of subsidiaries [line items]        
Current assets 182 1,338    
- of which cash and cash equivalent 46 32    
Non-current assets 1,698 569    
Total assets 1,880 1,907    
Current liabilities 339 1,232    
- current financial liabilities 42 25    
Non-current liabilities 1,050 270    
- non-current financial liabilities 997 78    
Total liabilities 1,389 1,502    
Net equity 491 405    
Book value of the investment 177 167    
Revenues and other operating income 462 1,239    
Operating expense (410) (1,051)    
Depreciation, depletion, amortization and impairments (27) (2)    
Operating profit 25 (625)    
Finance (expense) income 1 (439)    
Income (expense) from investments (30) 224    
Profit before income taxes (4) (215)    
Income taxes (5) (108)    
Net profit (9) (323)    
Other comprehensive income (13) (7)    
Total other comprehensive income (22) (330)    
Net profit attributable to Eni (7) (88)    
Dividends received by the associate € 1 € 39