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Basis of Presentation of the Consolidated Financial Statements - Impairment of Telefonicas assets Peru and ordinary insolvency procedure, Impairment of Goodwill Chile CGU (Details)
€ in Millions, S/ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Feb. 14, 2025
EUR (€)
Feb. 14, 2025
PEN (S/)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment € 866 € 58 € 0    
Impairment loss recognised in profit or loss, intangible assets other than goodwill 506 2      
Notional amount 84,933 € 81,097      
Credit Facility Due Aug 2026 | Loans and other debts          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Notional amount       € 394 S/ 1,549
Borrowing term       18 months 18 months
Pangea          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Reversal of deferred tax assets 13        
Impairment loss, property, plant and equipment 108        
Fiber optic assets in Peru          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment 34        
Peru          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment 226        
Reversal of deferred tax assets 91        
Net assets 124        
Peru | Telefónica Hispam          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment 226        
Peru | Fiber optic assets in Peru          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment 34        
Impairment loss recognised in profit or loss, intangible assets other than goodwill 54        
Chile | Telefónica Hispam          
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]          
Goodwill impairment € 397