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Net financial income/(expense) (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finance income expense [Abstract]      
Financial income from infrastructure project financing € 43 € 34 € 8
Financial expense from infrastructure project financing (382) (362) (251)
Financial result on financing of infrastructure projects (339) (328) (243)
Net financial income expense from derivatives and other fair value adjustments infrastructure project companies 9 13 (105)
Other net financial income expense infrastructure project companies (81) (57) (17)
Result on derivatives and other financial results infrastructure projects (72) (44) (122)
Financial result of infrastructure projects (411) (372) (365)
Financial income other companies 169 216 104
Financial expense other companies (95) (105) (103)
Financial result on financing excluding infrastructure projects 74 111 1
Financial assets at value of changes in results 574 11 47
Other net financial income expense other companies 37 20 0
Result on derivatives and other financial results excluding infrastructure projects 611 31 47
Financial result excluding infrastructure projects 685 142 48
Finance income (cost) € 274 € (230) € (317)
Change in percentage of financial income from infrastructure project financing 26.00% 325.00%  
Change in percentage of financial expense from infrastructure project financing 6.00% 44.00%  
Change in percentage of financial result on financing of infrastructure projects 3.00% 35.00%  
Change in percentage of net financial income expense from derivatives and other fair value adjustments infrastructure project companies (31.00%) (112.00%)  
Change in percentage of other net financial income expense infrastructure project companies 42.00% 235.00%  
Change in percentage of result on derivatives and other financial results infrastructure projects 64.00% (64.00%)  
Change in percentage of financial result of infrastructure projects 10.00% 2.00%  
Change in percentage of financial income other companies (22.00%) 108.00%  
Change in percentage of financial expense other companies (10.00%) 2.00%  
Change in percentage of financial result on financing excluding infrastructure projects (33.00%) 11000.00%  
Change in percentage of net financial income expense from derivatives and other fair value adjustments other companies 5118.00% (77.00%)  
Change in percentage of other net financial income expense other companies 85.00% 0.00%  
Change in percentage of result on derivatives and other financial results excluding infrastructure projects 1871.00% (34.00%)  
Change in percentage of financial result excluding infrastructure projects 382.00% 196.00%  
Change in percentage of finance income cost (219.00%) (27.00%)