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Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Investments    
Book amount - beginning of the year € 5,887 € 6,749
Additions and subscriptions 1,607 662
Divestments and reimbursements (480) (385)
Share of profit of equity-accounted investments 2,163 202
Share of loss of equity-accounted investments (285) (1,294)
Deduction for dividends (1,194) (627)
Change in the scope of consolidation (1,827) 360
Currency translation differences 1 381
Other changes 6,220 (161)
Book amount - end of the year 12,092 5,887
Investments in unconsolidated entities controlled by Eni    
Investments    
Book amount - beginning of the year 44 80
Additions and subscriptions 21 1
Divestments and reimbursements (2) (21)
Share of profit of equity-accounted investments 5 6
Share of loss of equity-accounted investments (6) (3)
Deduction for dividends (3) (25)
Change in the scope of consolidation 5 5
Currency translation differences 2 2
Other changes (16) (1)
Book amount - end of the year 50 44
Joint ventures    
Investments    
Book amount - beginning of the year 2,057 2,832
Additions and subscriptions 900 558
Divestments and reimbursements (1) (231)
Share of profit of equity-accounted investments 474 31
Share of loss of equity-accounted investments (197) (910)
Deduction for dividends (483) (586)
Change in the scope of consolidation (710) 355
Currency translation differences (231) 83
Other changes 5,256 (75)
Book amount - end of the year 7,065 2,057
Associates    
Investments    
Book amount - beginning of the year 3,786 3,837
Additions and subscriptions 686 103
Divestments and reimbursements (477) (133)
Share of profit of equity-accounted investments 1,684 165
Share of loss of equity-accounted investments (82) (381)
Deduction for dividends (708) (16)
Change in the scope of consolidation (1,122)  
Currency translation differences 230 296
Other changes 980 (85)
Book amount - end of the year € 4,977 € 3,786