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Other information about investments (Details 12) - 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
Book value of the investment 7,044 3,511 4,040  
Revenues and other operating income 1,919      
Operating expense (872)      
Depreciation, amortization and impairments (6,988) (7,483) (7,559)  
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    
Vår Energi AS [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 1,366      
- of which cash and cash equivalent 883      
Non-current assets 11,407      
Total assets 12,773      
Current liabilities 608      
Non-current liabilities 7,139      
- non-current financial liabilities 366      
Total liabilities 7,747      
Net equity € 5,026      
Eni's ownership interest (%) 69.60%      
Book value of the investment € 3,498      
Saipem SpA [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 6,211 6,743    
- of which cash and cash equivalent 1,674 1,751    
Non-current assets 5,466 5,847    
Total assets 11,677 12,590    
Current liabilities 4,430 4,487    
- current financial liabilities 305 189    
Non-current liabilities 3,211 3,504    
- non-current financial liabilities 2,646 2,929    
Total liabilities 7,641 7,991    
Net equity € 4,036 € 4,599    
Eni's ownership interest (%) 30.99% 31.00%    
Book value of the investment € 1,288 € 1,413    
Revenues and other operating income 8,530 9,038    
Operating expense (7,682) (8,172)    
Depreciation, amortization and impairments (811) (740)    
Operating profit 37 126    
Finance (expense) income (165) (223)    
Income (expense) from investments (88) (9)    
Profit before income taxes (216) (106)    
Income taxes (194) (201)    
Net profit (410) (307)    
Other comprehensive income (46) 49    
Total other comprehensive income (456) (258)    
Net profit attributable to Eni (146) (101)    
Union Fenosa Gas SA [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 664 610    
- of which cash and cash equivalent 107 32    
Non-current assets 832 877    
Total assets 1,496 1,487    
Current liabilities 260 234    
- current financial liabilities 22 40    
Non-current liabilities 581 580    
- non-current financial liabilities 510 506    
Total liabilities 841 814    
Net equity € 655 € 673    
Eni's ownership interest (%) 50.00% 50.00%    
Book value of the investment € 335 € 350    
Revenues and other operating income 1,521 1,340    
Operating expense (1,461) (1,308)    
Depreciation, amortization and impairments (70) (89)    
Operating profit (10) (57)    
Finance (expense) income (31) (38)    
Income (expense) from investments 9 3    
Profit before income taxes (32) (92)    
Income taxes (1) 1    
Net profit (33) (91)    
Other comprehensive income 15 (41)    
Total other comprehensive income (18) (132)    
Net profit attributable to Eni (23) (63)    
Petro Junin SA [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 368 365    
Non-current assets 253 628    
Total assets 621 993    
Current liabilities 470 434    
Non-current liabilities 34 34    
Total liabilities 504 468    
Net equity € 117 € 525    
Eni's ownership interest (%) 40.00% 40.00%    
Book value of the investment € 47 € 210    
Revenues and other operating income 112 135    
Operating expense (100) (66)    
Depreciation, amortization and impairments (394) (29)    
Operating profit (382) 40    
Finance (expense) income 31 47    
Profit before income taxes (351) 87    
Income taxes (19) (22)    
Net profit (370) 65    
Other comprehensive income 11 (68)    
Total other comprehensive income (359) (3)    
Net profit attributable to Eni (148) 26    
Gas Distribution Company of Thessaloniki Thessaly SA [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 32 86    
- of which cash and cash equivalent 13 15    
Non-current assets 302 289    
Total assets 334 375    
Current liabilities 52 94    
Non-current liabilities 2 2    
Total liabilities 54 96    
Net equity € 280 € 279    
Eni's ownership interest (%) 49.00% 49.00%    
Book value of the investment € 137 € 137    
Revenues and other operating income 53 54    
Operating expense (16) (14)    
Depreciation, amortization and impairments (12) (15)    
Operating profit 25 25    
Profit before income taxes 25 25    
Income taxes (8) (7)    
Net profit 17 18    
Total other comprehensive income 17 18    
Net profit attributable to Eni 8 9    
Dividends received from the joint venture 8 12    
Lotte Versalis Elastomeres Co [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 56 43    
- of which cash and cash equivalent 8 30    
Non-current assets 502 547    
Total assets 558 590    
Current liabilities 111 70    
- current financial liabilities 78 38    
Non-current liabilities 297 292    
- non-current financial liabilities 289 288    
Total liabilities 408 362    
Net equity € 150 € 228    
Eni's ownership interest (%) 50.00% 50.00%    
Book value of the investment € 75 € 114    
Revenues and other operating income 22      
Operating expense (58) (4)    
Depreciation, amortization and impairments (30)      
Operating profit (66) (4)    
Finance (expense) income (12)      
Profit before income taxes (78) (4)    
Net profit (78) (4)    
Other comprehensive income   (6)    
Total other comprehensive income (78) (10)    
Net profit attributable to Eni (39) (2)    
Cardon IV SA 1 [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 191 816    
- of which cash and cash equivalent 40 42    
Non-current assets 2,433 2,756    
Total assets 2,624 3,572    
Current liabilities 232 644    
Non-current liabilities 2,196 2,928    
- non-current financial liabilities 1,410 1,912    
Total liabilities 2,428 € 3,572    
Net equity € 196      
Eni's ownership interest (%) 50.00% 50.00%    
Book value of the investment € 98      
Revenues and other operating income 610 € 756    
Operating expense (372) (608)    
Depreciation, amortization and impairments (137) (357)    
Operating profit 101 (209)    
Finance (expense) income (208) (155)    
Profit before income taxes (107) (364)    
Income taxes (35) (4)    
Net profit (142) (368)    
Other comprehensive income 6 26    
Total other comprehensive income (136) (394)    
Net profit attributable to Eni (71) (184)    
Other joint ventures [Member]        
Disclosure of detailed information about investments [line items]        
Current assets 130 275    
- of which cash and cash equivalent 38 64    
Non-current assets 334 916    
Total assets 464 1,191    
Current liabilities 307 985    
- current financial liabilities 165 640    
Non-current liabilities 126 124    
- non-current financial liabilities 14 79    
Total liabilities 433 1,109    
Net equity 31 82    
Book value of the investment (2) 28    
Revenues and other operating income 731 412    
Operating expense (697) (433)    
Depreciation, amortization and impairments (62) (113)    
Operating profit (28) (134)    
Finance (expense) income (5) (53)    
Income (expense) from investments   (4)    
Profit before income taxes (33) (191)    
Income taxes (10) (11)    
Net profit (43) (202)    
Other comprehensive income (4)      
Total other comprehensive income (47) (202)    
Net profit attributable to Eni (21) (56)    
Dividends received from the joint venture € 11 € 29