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Non-current assets (Tables)
 12 Months Ended
Dec. 31, 2024
Non-current assets [abstract]  
Disclosure of investment in infrastructure projects [Text Block]
INVESTMENTS IN INFRASTRUCTURE PROJECTS
(Million euro)		20242023
Opening balance at 01.0113,495 13,667 
Additions87 695 
Depreciation(235)(235)
Disposals(14)(4)
Exchange rate effect814 (374)
Changes in the scope of consolidation and others— (254)
Closing balance at 12.3114,147 13,495 
Disclosure of investment in associates explanatory [Text Block]
INVESTMENTS IN ASSOCIATES
(Million euro)		20242023
Opening balance at 01.012,038 1,951 
Share of profit238 215 
Exchange rate effect60 (33)
Dividends(357)(321)
Capital contributions and new investments1,192 214 
Other movements(148)12 
Closing balance at 12.313,023 2,038