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Revenue and Expenses - Other Expenses Narrative (Details)
€ in Millions, R$ in Millions
12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) € 866   € 58 € 0
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets 1,525   33 124
Other operating expenses 165   370 273
Pangea        
Disclosure of transactions between related parties [line items]        
Impairment loss, property, plant and equipment 108      
Telefónica del Perú, S.A.        
Disclosure of transactions between related parties [line items]        
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets 54      
Telefónica Argentina        
Disclosure of transactions between related parties [line items]        
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets 1,274     77
Telefonica Brasil        
Disclosure of transactions between related parties [line items]        
Other operating expenses 67 R$ 386    
Reduction to tax expense due to decisions with tax authorities     51 € 73
Telefonica Tech UK & Ireland, Limited        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 192      
BE-terna        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 51      
Fiber optic assets in Peru        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 34      
Peru        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 226      
Peru | Telefónica Hispam        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 226      
Peru | Fiber optic assets in Peru        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) 34      
Chile | Telefónica Hispam        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7) € 397      
Ecuador | Telefónica Hispam        
Disclosure of transactions between related parties [line items]        
Goodwill impairment (Note 7)     € 58