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Rights of Use - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]    
Business combinations € 111  
Telefónica México    
Disclosure of quantitative information about right-of-use assets [line items]    
Increase in amortization, right-of-use assets 17 € 40
Oi Group    
Disclosure of quantitative information about right-of-use assets [line items]    
Business combinations 105  
Incremental Group Limited    
Disclosure of quantitative information about right-of-use assets [line items]    
Business combinations 1  
BE-terna    
Disclosure of quantitative information about right-of-use assets [line items]    
Business combinations € 5