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Tax Matters - Deferred Tax Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 4,884 € 5,616 € 6,416
Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,011 2,639 € 2,741
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,884    
Deferred tax assets for temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,205 4,610  
Telefónica, S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,884 5,616  
Telefónica, S.A. | Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,011 2,639  
Telefónica, S.A. | Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 565 903  
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 € 2,308 € 2,074