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Tax Matters - Deferred Tax Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 6,673 € 6,240 € 4,884
Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,877 2,803 € 2,011
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,673    
Deferred tax assets for temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,295 5,586  
Telefónica, S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,673 6,240  
Telefónica, S.A. | Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,877 2,803  
Telefónica, S.A. | Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,000 733  
Telefónica, S.A. | Deferred tax assets for temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 2,796 € 2,704