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Payables and Other Current Liabilities - Changes in Provision Law 18/2022 (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2022
EUR (€)
invoice
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Trade And Other Payables [Line Items]      
Total payments € 29,509 € 29,236 € 31,080
Telefónica, S.A.      
Trade And Other Payables [Line Items]      
Total payments 8,362 € 7,671  
Telefónica, S.A. | Law 18/2022      
Trade And Other Payables [Line Items]      
Total payments € 4,899    
Payments To Suppliers For Goods And Services, To Total, Percentage 0.59    
Number of Invoices, Payments To Suppliers For Goods And Services | invoice 157,523    
Number of Invoices, Payments To Suppliers For Goods And Services, To Total, Percentage 0.54