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Tax Matters - Constitutional Court Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Sep. 27, 2023
Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax credit expected, loss carryforwards of 2002   € 247
Tax credit expected, loss carryforwards of 2004   21
Tax credit expected, loss carryforwards of 2011   615
Tax credit expected, loss carryforwards of 2015   1,503
Tax credit expected, deductions for double taxation   952
Tax credit expected, deductions for reinvestments   23
Tax credit expected, deductions for investments   476
Tax credit expected, deductions for donations   260
Tax credit expected, deductions for fixed assets   101
Tax credit expected, deductions for reversal of temporary measures   29
Telefónica Spain    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax credits recognized € 334 € 334