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Revenues and other income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Products sales and service revenues      
Sales of crude oil € 25,685 € 26,277 € 18,283
Sales of oil products 25,508 30,770 19,624
Sales of natural gas and LNG 26,950 52,584 24,009
Sales of petrochemical products 4,385 6,244 5,659
Sales of power 7,252 12,448 5,104
Sales of other products 509 704 391
Services 3,428 3,485 3,505
Sales from operations 93,717 132,512 76,575
Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 92,905 131,441 75,754
Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations 812 1,071 821
Exploration & Production      
Products sales and service revenues      
Sales of crude oil 3,632 5,438 3,573
Sales of oil products 1,081 1,070 885
Sales of natural gas and LNG 5,858 6,108 4,122
Sales of other products 44 68 40
Services 228 205 226
Sales from operations 10,843 12,889 8,846
Exploration & Production | Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 10,526 12,585 8,506
Exploration & Production | Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations 317 304 340
Global Gas & LNG Portfolio      
Products sales and service revenues      
Sales of natural gas and LNG 16,638 40,840 16,608
Sales of other products 23   6
Services 249 390 359
Sales from operations 16,910 41,230 16,973
Global Gas & LNG Portfolio | Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 16,825 41,047 16,823
Global Gas & LNG Portfolio | Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations 85 183 150
Enilive, Refining and Chemicals      
Products sales and service revenues      
Sales of crude oil 22,053 20,839 14,710
Sales of oil products 24,427 29,700 18,739
Sales of natural gas and LNG 23 65 34
Sales of petrochemical products 4,385 6,241 5,652
Sales of other products 333 411 132
Services 944 1,214 784
Sales from operations 52,165 58,470 40,051
Enilive, Refining and Chemicals | Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 51,892 58,145 39,836
Enilive, Refining and Chemicals | Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations 273 325 215
Plenitude & Power      
Products sales and service revenues      
Sales of natural gas and LNG 4,431 5,571 3,245
Sales of power 7,252 12,448 5,104
Sales of other products 106 223 212
Services 1,809 1,484 1,956
Sales from operations 13,598 19,726 10,517
Plenitude & Power | Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 13,598 19,599 10,517
Plenitude & Power | Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations   127  
Corporate and Other activities      
Products sales and service revenues      
Sales of petrochemical products   3 7
Sales of other products 3 2 1
Services 198 192 180
Sales from operations 201 197 188
Corporate and Other activities | Goods/Services transferred in a specific moment      
Products sales and service revenues      
Sales from operations 64 65 72
Corporate and Other activities | Goods/Services transferred over a period of time      
Products sales and service revenues      
Sales from operations € 137 € 132 € 116