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Basis of Presentation of the Consolidated Financial Statements - Agreement between Telefonica de Espana (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 20, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Apr. 20, 2022
Disclosure of subsidiaries [line items]          
Increase (decrease) in equity through change in equity of equity holders   € (1,438) € (1,579) € 781  
Deferred tax assets   6,673 6,240 4,884  
Deferred tax assets for temporary differences          
Disclosure of subsidiaries [line items]          
Deferred tax assets   5,295 5,586    
Retained earnings          
Disclosure of subsidiaries [line items]          
Increase (decrease) in equity through change in equity of equity holders   12   936  
Non-controlling interests          
Disclosure of subsidiaries [line items]          
Increase (decrease) in equity through change in equity of equity holders   € (1,450) (1,579) € (155)  
Bluevia Fibra S.L.U. | Deferred tax assets for temporary differences          
Disclosure of subsidiaries [line items]          
Deferred tax assets     € 548    
Bluevia Fibra S.L.U. | Retained earnings          
Disclosure of subsidiaries [line items]          
Increase (decrease) in equity through change in equity of equity holders € 986        
Bluevia Fibra S.L.U. | Non-controlling interests          
Disclosure of subsidiaries [line items]          
Increase (decrease) in equity through change in equity of equity holders € 23        
Vauban/CAA | Bluevia Fibra S.L.U.          
Disclosure of subsidiaries [line items]          
Proportion of voting rights held in associate (in percentage) 45.00%        
Total         € 1,021