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Share of profits of equity-accounted companies (Tables)
 12 Months Ended
Dec. 31, 2025
Investments accounted for using equity method [abstract]  
Disclosure of detailed information about investments accounted for using equity method [Table Text Block]
Profit/(loss) of equity-accounted companies
(Million euro)		202520242023
407 ETR217 188 154 
JFK NTO4 3 4 
IRB25 13 14 
Private InvIT(6)(8)— 
Other18 42 43 
TOTAL258 238 215