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Property, plant and equipment - Additional information (Details)
€ in Millions
12 Months Ended
Feb. 28, 2023
NUMBER
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Property, plant and equipment          
Borrowing costs capitalised   € 94 € 38 € 68  
Capital expenditure   8,739 7,700    
Expenditures to purchase plant and equipment from suppliers   966      
Currency translation differences   (1,578) 2,926    
Property, plant and equipment   56,299 56,332 56,299  
Property, plant and equipment, pledged as security   24      
Government grants   91 115    
Other changes   (686) (189)    
Write-off   € 447 586    
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent)   7.00%      
Novamont group          
Property, plant and equipment          
Changes in the scope of consolidation   € 255      
Proportion of ownership interest in joint operation   36.00%      
Property, plant and equipment subject to operating leases          
Property, plant and equipment          
Property, plant and equipment   € 347      
Accumulated impairment          
Property, plant and equipment          
Property, plant and equipment   (22,650) (21,715)    
US Dollars          
Property, plant and equipment          
Currency translation differences   1,572      
Nigeria | Oando PLC          
Property, plant and equipment          
Other changes   914      
Nigeria | Oil Prospecting License 245          
Property, plant and equipment          
Property, plant and equipment   € 1,208      
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent)   8.00%      
Algeria | BP business          
Property, plant and equipment          
Changes in the scope of consolidation   € 548      
Algeria | Eni In Amenas Ltd and Eni In Salah Ltd          
Property, plant and equipment          
Number of gas producing concessions   2      
Congo          
Property, plant and equipment          
Other changes   € 355      
Unproved mineral interest          
Property, plant and equipment          
Property, plant and equipment   2,159 2,003 1,819  
Net (impairments) reversals   (158) (9)    
Unproved mineral interest | Oil Prospecting License 245          
Property, plant and equipment          
Property, plant and equipment   € 888      
Unproved mineral interest | Oil Prospecting License 245 | Nigeria Government          
Property, plant and equipment          
Proportion of ownership interest in joint operation   50.00%      
E&P wells, plant and machinery          
Property, plant and equipment          
Capital expenditure     132    
Currency translation differences   € (1,223) 2,422    
Property, plant and equipment   37,421 40,492 42,342  
Other changes   (1,905) 143    
E&P wells, plant and machinery | Ivory Coast, Italy, Congo, Egypt, Iraq, Mexico, United States and Algeria          
Property, plant and equipment          
Transfers   5,355      
E&P exploration assets and appraisal          
Property, plant and equipment          
Capital expenditure   764 655    
Currency translation differences   (46) 74    
Property, plant and equipment   1,568 1,345 1,244  
Other changes   (42) 1    
Write-off   420 365    
E&P exploration assets and appraisal | Egypt, Mexico, Mozambique, Morocco, United Arab Emirates and Lebanon [member]          
Property, plant and equipment          
Write-off   420      
Suspended exploration wells pending final determination          
Property, plant and equipment          
Currency translation differences   (40) 65 100  
Changes in the scope of consolidation     (114) (199)  
Property, plant and equipment   1,391 1,085 1,101 € 1,268
Other changes   (25) 9 (24)  
Exploration wells in progress          
Property, plant and equipment          
Property, plant and equipment   177      
Petrochemical plants [member]          
Property, plant and equipment          
Net (impairments) reversals   367      
Oil and Gas properties [member] | Alaska, Gulf of Mexico, Turkmenistan, Italy and Australia          
Property, plant and equipment          
Net (impairments) reversals   1,025      
Ganal PSC and Rapak PSC [member] | Eni Ganal Deepwater Ltd and Eni Rapak Deepwater Ltd          
Property, plant and equipment          
Changes in the scope of consolidation   € 104      
Ganal block [member]          
Property, plant and equipment          
Percentage of interest in project   20.00%      
Ganal block [member] | Eni Ganal Deepwater Ltd [Member]          
Property, plant and equipment          
Percentage of voting equity interests acquired (in percent)   62.00%      
Rapak block [member]          
Property, plant and equipment          
Percentage of interest in project   20.00%      
Rapak block [member] | Eni Rapak Deepwater Ltd [Member]          
Property, plant and equipment          
Percentage of voting equity interests acquired (in percent)   62.00%      
Makassar block [member] | Eni Makassar Ltd [Member]          
Property, plant and equipment          
Percentage of voting equity interests acquired (in percent)   72.00%      
Exploration & Production          
Property, plant and equipment          
Borrowing costs capitalised   € 64 € 22    
Average Interest rate used for capitalizing finance expense   3.00% 2.10%    
Capital expenditure   € 7,105 € 6,185    
Exploration & Production | Algeria | BP business          
Property, plant and equipment          
Number of gas producing concessions | NUMBER 2        
Plenitude | HLS Bonete PV SLU and HLS Bonete Topco SLU          
Property, plant and equipment          
Changes in the scope of consolidation   168      
Cash-generating units [member] | Enilive, Refining and Chemicals          
Property, plant and equipment          
Net (impairments) reversals   345      
fields including commercial discoveries that proceeds to sanctioning | Suspended exploration wells pending final determination          
Property, plant and equipment          
Property, plant and equipment   € 170 € 302 € 359