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Operations Classified as Held for Sale - Balance Sheet Breakdown Of Asset Held For Sale And Liabilities Assumed (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]      
Fiber optic assets in Peru € 78,133 € 83,568  
Goodwill 16,461 18,708  
Property, plant and equipment 21,439 22,944 € 23,714
Others 2,064 2,067  
Investment in Nabiax 232 325  
Non-current assets and disposal groups held for sale 138 273  
Liabilities associated with non-current assets and disposal groups held for sale 33 37  
Disposal groups classified as held for sale      
Disclosure of subsidiaries [line items]      
Other assets 3 0  
Disposal groups classified as held for sale | Peru      
Disclosure of subsidiaries [line items]      
Fiber optic assets in Peru 77 273  
Goodwill 0 34  
Property, plant and equipment 33 198  
Others 44 41  
Investment in Nabiax 58 0  
Total allocated liabilities € 33 € 37