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Segment information and information by geographical area - Restated for homogeneous comparison (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2020
EUR (€)
item
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Reportable segments      
Number of new general departments | item 2    
Sales from operations € 43,987 € 69,881 € 75,822
Operating profit (3,275) 6,432 9,983
Assets 109,648 123,440  
Liabilities 72,155 75,540  
Previously stated      
Reportable segments      
Sales from operations   69,881 75,822
Operating profit   6,432 9,983
Allocated amounts      
Reportable segments      
Assets 79,604 91,795 85,483
Liabilities 32,405 36,401 34,540
Allocated amounts | Previously stated      
Reportable segments      
Assets   91,795 85,483
Liabilities   36,401 34,540
Elimination of intersegment amounts      
Reportable segments      
Operating profit 33 (120) 211
Assets (402) (492) (420)
Liabilities (83) (141) (275)
Elimination of intersegment amounts | Previously stated      
Reportable segments      
Operating profit   (120) 211
Assets   (492) (420)
Liabilities   (141) (275)
Exploration & Production      
Reportable segments      
Sales from operations 6,359 10,499 9,943
Exploration & Production | Previously stated      
Reportable segments      
Sales from operations   10,499 9,943
Exploration & Production | Operating segments      
Reportable segments      
Sales from operations 13,590 23,572 25,744
Operating profit (610) 7,417 10,214
Assets 59,439 68,915 63,051
Liabilities 17,501 20,164 18,110
Exploration & Production | Operating segments | Previously stated      
Reportable segments      
Sales from operations   23,572 25,744
Operating profit   7,417 10,214
Assets   68,915 63,051
Liabilities   20,164 18,110
Exploration & Production | Elimination of intersegment amounts      
Reportable segments      
Sales from operations (7,231) (13,073) (15,801)
Exploration & Production | Elimination of intersegment amounts | Previously stated      
Reportable segments      
Sales from operations   (13,073) (15,801)
Gas & Power | Previously stated      
Reportable segments      
Sales from operations   38,160 43,109
Gas & Power | Operating segments | Previously stated      
Reportable segments      
Sales from operations   50,015 55,690
Operating profit   699 629
Assets   9,176 9,989
Liabilities   7,852 8,314
Gas & Power | Elimination of intersegment amounts | Previously stated      
Reportable segments      
Sales from operations   (11,855) (12,581)
Global Gas & LNG Portfolio      
Reportable segments      
Sales from operations 5,362 9,230 11,931
Global Gas & LNG Portfolio | Operating segments      
Reportable segments      
Sales from operations 7,051 11,779 14,807
Operating profit (332) 431 387
Assets 4,020 4,092 4,642
Liabilities 3,785 3,836 4,089
Global Gas & LNG Portfolio | Elimination of intersegment amounts      
Reportable segments      
Sales from operations (1,689) (2,549) (2,876)
Refining & Marketing and Chemical      
Reportable segments      
Sales from operations 24,937 41,976 46,088
Refining & Marketing and Chemical | Previously stated      
Reportable segments      
Sales from operations   21,017 22,594
Refining & Marketing and Chemical | Operating segments      
Reportable segments      
Sales from operations 25,340 42,360 46,483
Operating profit (2,463) (682) (501)
Assets 10,716 13,569 13,099
Liabilities 5,460 6,272 6,201
Refining & Marketing and Chemical | Operating segments | Previously stated      
Reportable segments      
Sales from operations   23,334 25,216
Operating profit   (854) (380)
Assets   12,336 11,692
Liabilities   4,599 4,319
Refining & Marketing and Chemical | Elimination of intersegment amounts      
Reportable segments      
Sales from operations (403) (384) (395)
Refining & Marketing and Chemical | Elimination of intersegment amounts | Previously stated      
Reportable segments      
Sales from operations   (2,317) (2,622)
Eni gas e luce, Power & Renewables      
Reportable segments      
Sales from operations 7,135 7,972 7,684
Eni gas e luce, Power & Renewables | Operating segments      
Reportable segments      
Sales from operations 7,536 8,448 8,218
Operating profit 660 74 340
Assets 4,387 4,068 4,008
Liabilities 2,426 2,380 2,364
Eni gas e luce, Power & Renewables | Elimination of intersegment amounts      
Reportable segments      
Sales from operations (401) (476) (534)
Corporate and Other activities      
Reportable segments      
Sales from operations 194 204 176
Corporate and Other activities | Previously stated      
Reportable segments      
Sales from operations   205 176
Corporate and Other activities | Operating segments      
Reportable segments      
Sales from operations 1,559 1,676 1,588
Operating profit (563) (688) (668)
Assets 1,444 1,643 1,103
Liabilities 3,316 3,890 4,051
Corporate and Other activities | Operating segments | Previously stated      
Reportable segments      
Sales from operations   1,681 1,589
Operating profit   (710) (691)
Assets   1,860 1,171
Liabilities   3,927 4,072
Corporate and Other activities | Elimination of intersegment amounts      
Reportable segments      
Sales from operations € (1,365) (1,472) (1,412)
Corporate and Other activities | Elimination of intersegment amounts | Previously stated      
Reportable segments      
Sales from operations   € (1,476) € (1,413)