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Tax Matters - Deferred Tax Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 6,240 € 4,884 € 5,616
Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,803 2,011 € 2,639
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,240    
Deferred tax assets for temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,586 5,205  
Telefónica, S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,240 4,884  
Telefónica, S.A. | Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,803 2,011  
Telefónica, S.A. | Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 733 565  
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 € 2,704 € 2,308