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Revenue and Expenses - Estimated Payment Schedule, Headcount Narrative (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
employee
Dec. 31, 2023
EUR (€)
employee
Disclosure of finance lease and operating lease by lessee [Line Items]    
Purchase and other contractual obligations € 58  
Operating lease obligations, at present value   € 5
Percentage of female employees 40.00% 39.00%
Operating segments    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Number of employees with disabilities | employee 2,700 2,572
Operating segments | Telefónica Spain    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Number of employees with disabilities | employee 487 462
Telefonica Spain and Germany    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Purchase commitment amount € 1,033