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Financial Liabilities - Narrative (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial liabilities [line items]    
Pending payment amount from undiscounted cash flows of loans and other payables   € 36,000,000
Payments made from undiscounted cash flows of loans and other payables € 41,000,000 108,000,000
Debentures and bonds issued 31,095,000,000 32,156,000,000
Commercial papers issuable 5,000,000,000  
Promissory notes issued 31,095,000,000  
Commercial papers issued   999,000,000
Promissory notes issuable, allowed increase 500  
Available financing capacity 11,737,000,000 12,182,000,000
Available financing capacity related to fulfillment of sustainability objectives 10,114,000,000  
Borrowings maturing in more than twelve months 11,434,000,000  
Sustainability Linked Bilateral Facilities    
Disclosure of financial liabilities [line items]    
Available financing capacity related to fulfillment of sustainability objectives 3,864,000,000  
Telefónica Germany GmbH & Co. OHG | Syndicated Loan Due December 17, 2026    
Disclosure of financial liabilities [line items]    
Available financing capacity related to fulfillment of sustainability objectives 750,000,000  
Telefónica, S.A.    
Disclosure of financial liabilities [line items]    
Collateral liabilities deposit 580,000,000 € 309,000,000
Telefónica, S.A. | Credit Facility due March 01, 2023    
Disclosure of financial liabilities [line items]    
Available financing capacity related to fulfillment of sustainability objectives 5,500,000,000  
Maximum    
Disclosure of financial liabilities [line items]    
Promissory notes issuable, allowed increase € 2,000,000,000  
Latin America    
Disclosure of financial liabilities [line items]    
Proportion of gross debt (as a percent) 1.00%  
2023    
Disclosure of financial liabilities [line items]    
Interest payable € 1,254,000,000  
Promissory notes issued 1,477,000,000  
2024    
Disclosure of financial liabilities [line items]    
Interest payable 1,147,000,000  
Promissory notes issued 1,130,000,000  
2025    
Disclosure of financial liabilities [line items]    
Interest payable 1,057,000,000  
Promissory notes issued 3,130,000,000  
2026    
Disclosure of financial liabilities [line items]    
Interest payable 978,000,000  
Promissory notes issued 2,101,000,000  
2027    
Disclosure of financial liabilities [line items]    
Interest payable 871,000,000  
Promissory notes issued 4,178,000,000  
Subsequent years    
Disclosure of financial liabilities [line items]    
Interest payable 7,840,000,000  
Promissory notes issued 19,079,000,000  
Derivative instruments    
Disclosure of financial liabilities [line items]    
Fair value of current financial liabilities 712,000,000  
Fair value of non-current liabilities 2,668,000,000  
Commercial Paper    
Disclosure of financial liabilities [line items]    
Promissory notes issued € 500,000,000  
Average interest rate (as a percent) 0.28% 0.46%
Promissory note    
Disclosure of financial liabilities [line items]    
Promissory notes issued € 0 € 30,000,000
Loans and other payables    
Disclosure of financial liabilities [line items]    
Average interest rate (as a percent) 3.45% 1.30%