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Payables and Other Current Liabilities - Information on Average Payment Period to Suppliers (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Payments to Suppliers [Line Items]      
Total payments € 29,188 € 29,509 € 29,236
Telefónica, S.A.      
Payments to Suppliers [Line Items]      
Weighted average maturity period 51 days 53 days  
Ratio of payments 53 days 55 days  
Ratio of outstanding invoices 39 days 42 days  
Total payments € 7,897 € 8,362  
Outstanding invoices € 1,211 € 1,251