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Equity - Translation Differences (Details) - EUR (€)
€ in Millions
 12 Months Ended
Jun. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   € (20,723) € (21,892) € (25,980)
Telxius Towers        
Disclosure of reserves within equity [line items]        
Foreign exchange loss   37    
Telefónica de Costa Rica TC, S.A.        
Disclosure of reserves within equity [line items]        
Foreign exchange loss   21    
VMO2        
Disclosure of reserves within equity [line items]        
Foreign exchange loss € 3,135      
Brazilian real        
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   (14,031) (15,292) (15,365)
Pound sterling        
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   (322) 309 (3,344)
Venezuelan bolivar        
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   (3,734) (3,755) (3,754)
Argentine peso        
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   (1,364) (1,702) (2,178)
Other currencies        
Disclosure of reserves within equity [line items]        
Accumulated contribution of translation differences   € (1,272) € (1,452) € (1,339)