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Appendix III: Debentures and Bonds - Debentures and Bonds Issued (Details)
€ in Millions, R$ in Millions
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
BRL (R$)
Disclosure of detailed information about borrowings [line items]    
Debentures and bonds € 31,095  
Telefónica Emisiones, S.A.U. | Telefonica Emisiones EMTN Bond | 13 July 2040    
Disclosure of detailed information about borrowings [line items]    
Debentures and bonds 100  
Telefónica Emisiones, S.A.U. | Telefonica Emisiones EMTN Bond | 25 May 2031    
Disclosure of detailed information about borrowings [line items]    
Debentures and bonds € 1,000  
Telefónica Emisiones, S.A.U. | Telefonica Emisiones EMTN Bond | Fixed interest rate | 13 July 2040    
Disclosure of detailed information about borrowings [line items]    
Interest rate (as a percent) 1.864% 1.864%
Telefónica Emisiones, S.A.U. | Telefonica Emisiones EMTN Bond | Fixed interest rate | 25 May 2031    
Disclosure of detailed information about borrowings [line items]    
Interest rate (as a percent) 2.592% 2.592%
Telefónica Brasil, S.A. | Debentures | 12 July 2027    
Disclosure of detailed information about borrowings [line items]    
Debentures and bonds € 359 R$ 2,000
Telefónica Brasil, S.A. | Debentures | 12 July 2025    
Disclosure of detailed information about borrowings [line items]    
Debentures and bonds € 269 R$ 1,500
Telefónica Brasil, S.A. | Debentures | Fixed interest rate | 12 July 2027    
Disclosure of detailed information about borrowings [line items]    
Interest rate (as a percent) 1.35% 1.35%
Telefónica Brasil, S.A. | Debentures | Fixed interest rate | 12 July 2025    
Disclosure of detailed information about borrowings [line items]    
Interest rate (as a percent) 1.12% 1.12%