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Associates and Joint Ventures - Breakdown of Key Financial Highlights (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Joint Ventures And Associates [Line Items]        
Assets € 104,324 € 109,642    
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]        
Group’s share in equity 27,096 31,708 € 28,684 € 18,260
Goodwill 18,708 18,471    
Carrying amount in the Telefónica Group 325 312    
Prosegur Soluciones S.A.U. | Movistar Prosegur Alarmas        
Disclosure Of Joint Ventures And Associates [Line Items]        
Assets 391 352    
Liabilities 383 346    
Net assets 8 6    
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]        
Assets 76 136    
Liabilities 20 35    
Liabilities assumed and other costs (see Note 29.c) € 56 € 101    
Proportion of ownership interest in joint venture (as a percent) 50.00% 50.00%    
Group’s share in equity € 32 € 54    
Goodwill 198 198    
Carrying amount in the Telefónica Group € 230 € 252