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Intangible assets - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Oct. 28, 2021
Jun. 03, 2021
Apr. 07, 2021
Intangible assets          
Write-off € 35 € 24      
Change in the scope of consolidation 1,835 77      
Goodwill 2,862 € 1,297      
Be Power          
Intangible assets          
Change in the scope of consolidation € 728        
Percentage of voting equity interests acquired 100.00%        
Goodwill € 728        
Aldro Energa Y Soluciones SLU          
Intangible assets          
Change in the scope of consolidation € 168        
Percentage of voting equity interests acquired 100.00%       100.00%
Portfolio Of Thirteen Onshore Wind Facilities          
Intangible assets          
Change in the scope of consolidation € 302        
Dhamma Energy Group          
Intangible assets          
Change in the scope of consolidation 120        
Finproject SpA          
Intangible assets          
Change in the scope of consolidation 93        
Percentage of voting equity interests acquired     60.00%    
Portfolio Of Nine Renewable Energy Projects          
Intangible assets          
Change in the scope of consolidation 81        
FRI-EL Biogas Holding SpA          
Intangible assets          
Change in the scope of consolidation € 80        
Percentage of voting equity interests acquired 100.00%     100.00%  
CGU Domestic-Foreign Market          
Intangible assets          
Goodwill € 1,214        
Period over which management has projected cash flows 4 years        
Growth rate used to extrapolate cash flow projections 0.00% 0.00%      
Discount rate applied to cash flow projections 4.90%        
Amount by which unit's recoverable amount exceeds its carrying amount € 5,000        
CGU Domestic-Foreign Market | Aldro Energa Y Soluciones SLU          
Intangible assets          
Percentage of voting equity interests acquired 100.00%        
Goodwill € 168        
CGU Domestic-Foreign Market | Minorities of former Italgas          
Intangible assets          
Goodwill 706        
CGU Domestic-Foreign Market | Local Italian companies synergic to main areas of activity          
Intangible assets          
Goodwill 198        
CGU Domestic-Foreign Market | Eni Gas and Power France SA          
Intangible assets          
Goodwill 95        
Accumulated impairment          
Intangible assets          
Goodwill (2,500)        
Exploration rights          
Intangible assets          
Write-off 35 € 19      
Capitalized costs for customer acquisition | Plenitude & Power          
Intangible assets          
Intangible assets other than goodwill 348 262      
Concessions, licenses, trademarks and similar items          
Intangible assets          
Intangible assets other than goodwill 139 88      
Transport rights of natural gas          
Intangible assets          
Intangible assets other than goodwill 32 25      
Customer relationship          
Intangible assets          
Intangible assets other than goodwill 109        
Intangible assets in progress          
Intangible assets          
Intangible assets other than goodwill € 78 € 78