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Associates and Joint Ventures - Breakdown of Key Financial Highlights (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Joint Ventures And Associates [Line Items]        
Assets € 109,642 € 109,213    
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]        
Group’s share in equity 31,708 28,684 € 18,260 € 25,450
Goodwill 18,471 16,519    
Carrying amount in the Telefónica Group 312 251    
Prosegur Soluciones S.A.U. | Movistar Prosegur Alarmas        
Disclosure Of Joint Ventures And Associates [Line Items]        
Assets 352 224    
Liabilities 346 202    
Net assets 6 22    
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]        
Assets 136 146    
Liabilities 35 38    
Liabilities assumed and other costs (see Note 29.c) € 101 € 108    
Proportion of ownership interest in joint venture (as a percent) 50.00% 50.00%    
Group’s share in equity € 54 € 65    
Goodwill 198 198    
Carrying amount in the Telefónica Group € 252 € 263