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Right-of-use assets and lease liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Right-of-use assets      
Net carrying amount - beginning of period € 4,446 € 4,821  
Additions 1,584 2,404  
Depreciation (973) (1,013) € (928)
Impairment (41) (18) (59)
Reversals 5 14  
Currency translation differences (89) 267  
Changes in the scope of consolidation 13 (1,879)  
Other changes (111) (150)  
Net carrying amount - end of period 4,834 4,446 4,821
Lessee's exposure arising from options for extension or termination of lease for office buildings 1,177    
Lessee's exposure arising from extension options related to service stations for sale of oil products 133    
Exploration & Production      
Right-of-use assets      
Net carrying amount - beginning of period 2,653    
Additions 1,023    
Net carrying amount - end of period 2,959 € 2,653  
Exploration & Production | Ghana and Angola | Minimum      
Right-of-use assets      
Lease, term of contract   13 years  
Exploration & Production | Ghana and Angola | Maximum      
Right-of-use assets      
Lease, term of contract   17 years  
Enilive, Refining and Chemicals [member]      
Right-of-use assets      
Net carrying amount - beginning of period 800    
Additions 408    
Net carrying amount - end of period 965 € 800  
Corporate and Other activities      
Right-of-use assets      
Net carrying amount - beginning of period 548    
Additions 63    
Net carrying amount - end of period 519 548  
Upstream business      
Right-of-use assets      
Lessee's exposure arising from other extension options related to ancillary assets 545    
Floating production storage and offloading vessels (FPSO)      
Right-of-use assets      
Net carrying amount - beginning of period 2,142 2,667  
Additions 14 1,342  
Depreciation (145) (226)  
Currency translation differences (71) 239  
Changes in the scope of consolidation   (1,878)  
Other changes 37 (2)  
Net carrying amount - end of period 1,977 2,142 2,667
Drilling rig      
Right-of-use assets      
Net carrying amount - beginning of period 148 183  
Additions 570 189  
Depreciation (219) (197)  
Currency translation differences (8) 12  
Changes in the scope of consolidation   (34)  
Other changes (42) (5)  
Net carrying amount - end of period 449 148 183
Drilling rig | Exploration & Production      
Right-of-use assets      
Additions 570    
Naval facilities and related logistic bases for oil and gas transportation      
Right-of-use assets      
Net carrying amount - beginning of period 682 575  
Additions 402 530  
Depreciation (315) (303)  
Impairment (3) (5)  
Reversals 3 14  
Currency translation differences (5) 10  
Changes in the scope of consolidation   (39)  
Other changes (40) (100)  
Net carrying amount - end of period 724 682 575
Motorway concessions and service stations      
Right-of-use assets      
Net carrying amount - beginning of period 457 454  
Additions 133 76  
Depreciation (74) (70)  
Currency translation differences 4 3  
Other changes (28) (6)  
Net carrying amount - end of period 492 457 454
Motorway concessions and service stations | Enilive, Refining and Chemicals [member]      
Right-of-use assets      
Additions 146    
Oil and gas distribution facilities      
Right-of-use assets      
Net carrying amount - beginning of period 19 14  
Additions 19 28  
Depreciation (18) (13)  
Impairment (2) (5)  
Other changes (1) (5)  
Net carrying amount - end of period 17 19 14
Oil and gas distribution facilities | Exploration & Production      
Right-of-use assets      
Additions 167    
Office buildings      
Right-of-use assets      
Net carrying amount - beginning of period 595 618  
Additions 110 108  
Depreciation (125) (130)  
Currency translation differences (2) 3  
Changes in the scope of consolidation 3 (1)  
Other changes (1) (3)  
Net carrying amount - end of period 580 595 618
Lease commitment, nominal value € 437    
Lease commitment, term of contract 20 years    
Lease commitment, extension option 6 years    
Vehicles      
Right-of-use assets      
Net carrying amount - beginning of period € 42 48  
Additions 14 21  
Depreciation (12) (21)  
Impairment   (1)  
Other changes (27) (5)  
Net carrying amount - end of period 17 42 48
Other      
Right-of-use assets      
Net carrying amount - beginning of period 361 262  
Additions 322 110  
Depreciation (65) (53)  
Impairment (36) (7)  
Reversals 2    
Currency translation differences (7)    
Changes in the scope of consolidation 10 73  
Other changes (9) (24)  
Net carrying amount - end of period 578 361 € 262
Vessels      
Right-of-use assets      
Lease commitment, nominal value 131    
Vessels | Enilive, Refining and Chemicals [member]      
Right-of-use assets      
Additions 220    
Assets for staff activities | Corporate and Other activities      
Right-of-use assets      
Additions 44    
Gross carrying amount      
Right-of-use assets      
Net carrying amount - beginning of period 6,862    
Net carrying amount - end of period 7,802 6,862  
Gross carrying amount | Floating production storage and offloading vessels (FPSO)      
Right-of-use assets      
Net carrying amount - beginning of period 2,507    
Net carrying amount - end of period 2,409 2,507  
Gross carrying amount | Drilling rig      
Right-of-use assets      
Net carrying amount - beginning of period 516    
Net carrying amount - end of period 985 516  
Gross carrying amount | Naval facilities and related logistic bases for oil and gas transportation      
Right-of-use assets      
Net carrying amount - beginning of period 1,360    
Net carrying amount - end of period 1,593 1,360  
Gross carrying amount | Motorway concessions and service stations      
Right-of-use assets      
Net carrying amount - beginning of period 734    
Net carrying amount - end of period 822 734  
Gross carrying amount | Oil and gas distribution facilities      
Right-of-use assets      
Net carrying amount - beginning of period 87    
Net carrying amount - end of period 81 87  
Gross carrying amount | Office buildings      
Right-of-use assets      
Net carrying amount - beginning of period 1,010    
Net carrying amount - end of period 1,039 1,010  
Gross carrying amount | Vehicles      
Right-of-use assets      
Net carrying amount - beginning of period 86    
Net carrying amount - end of period 47 86  
Gross carrying amount | Other      
Right-of-use assets      
Net carrying amount - beginning of period 562    
Net carrying amount - end of period 826 562  
Provisions for depreciation and impairment      
Right-of-use assets      
Net carrying amount - beginning of period (2,416)    
Net carrying amount - end of period (2,968) (2,416)  
Provisions for depreciation and impairment | Floating production storage and offloading vessels (FPSO)      
Right-of-use assets      
Net carrying amount - beginning of period (365)    
Net carrying amount - end of period (432) (365)  
Provisions for depreciation and impairment | Drilling rig      
Right-of-use assets      
Net carrying amount - beginning of period (368)    
Net carrying amount - end of period (536) (368)  
Provisions for depreciation and impairment | Naval facilities and related logistic bases for oil and gas transportation      
Right-of-use assets      
Net carrying amount - beginning of period (678)    
Net carrying amount - end of period (869) (678)  
Provisions for depreciation and impairment | Motorway concessions and service stations      
Right-of-use assets      
Net carrying amount - beginning of period (277)    
Net carrying amount - end of period (330) (277)  
Provisions for depreciation and impairment | Oil and gas distribution facilities      
Right-of-use assets      
Net carrying amount - beginning of period (68)    
Net carrying amount - end of period (64) (68)  
Provisions for depreciation and impairment | Office buildings      
Right-of-use assets      
Net carrying amount - beginning of period (415)    
Net carrying amount - end of period (459) (415)  
Provisions for depreciation and impairment | Vehicles      
Right-of-use assets      
Net carrying amount - beginning of period (44)    
Net carrying amount - end of period (30) (44)  
Provisions for depreciation and impairment | Other      
Right-of-use assets      
Net carrying amount - beginning of period (201)    
Net carrying amount - end of period € (248) € (201)