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Tax Matters - Tax Credits for Loss Carry-Forwards, Deductions, Temporary Differences Narrative (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]      
Tax loss carryforwards generated in the tax group € 5,426    
Deferred tax assets 6,673 € 6,240 € 4,884
Total unused tax credits | Pegaso Pcs S.A. de C.V. and Colombia Telecomunicaciones S.A. ESP BIC      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 886 982  
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,673    
Spain      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax loss carryforwards generated in the tax group 113 77  
Deferred tax assets 1,277 1,110  
Spain | Total unused tax credits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,000 733  
Spain | Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 123 244  
Germany      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax loss carryforwards generated in the tax group 5,168 5,295  
Deferred tax assets 970 879  
Latin America      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax loss carryforwards generated in the tax group 797 841  
Deferred tax assets € 630 € 814