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Tax Matters - Reconciliation of Profit Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Increase/(decrease) in tax expense arising from temporary differences € 599 € 11 € 43
Tax effect of other permanent differences (165) (442) 793
Corporate income tax 348 (899) 641
Telecommunications Law, Law 14.195      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax effect of other permanent differences     651
Deferred tax assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Increase/(decrease) in tax expense arising from temporary differences 410    
Deferred tax liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Increase/(decrease) in tax expense arising from temporary differences 535    
Reconciliation Share Of Loss Of VMO2      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax effect of other permanent differences   477  
Telefónica, S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Reversal of deferred tax assets for tax credits 236 173 112
Unrecorded tax loss carryforwards 174 368 326
Reversal of deferred tax assets for tax loss carryforwards     85
Telefónica Germany      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax credits recognized   115 76
Telefónica Germany | Deferred tax assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Reversal of deferred tax assets   334  
Group 3G UMTS Holding GmbH      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax credits recognized € 106 € 73 76
Group 3G UMTS Holding GmbH Holding Company | Tax Expense (Income)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused provision reversed, other provisions     186
Group 3G UMTS Holding GmbH Holding Company | Finance Income      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused provision reversed, other provisions     69
Telefónica Peru | Tribunal Economico-Administrativo Central - Overpayments in 2008-2011      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Corporate income tax     € 241