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Financial Liabilities - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Nov. 30, 2023
Disclosure of financial liabilities [line items]        
Current financial assets € 1,800 € 1,078    
Non-current financial assets 5,339 5,201    
Payments of lease liabilities, classified as financing activities 222 245 € 698  
Promissory notes issued 30,979      
Debentures and bonds issued   29,779    
Commercial papers issuable 5,000      
Commercial papers issued   1,000    
Promissory notes issuable, allowed increase 500      
Available financing capacity 11,017 11,315    
Borrowings maturing in more than twelve months 10,634      
Less than 1 year        
Disclosure of financial liabilities [line items]        
Interest payable 1,308      
Promissory notes issued 3,092      
2026        
Disclosure of financial liabilities [line items]        
Interest payable 1,187      
Promissory notes issued 2,134      
2027        
Disclosure of financial liabilities [line items]        
Interest payable 1,045      
Promissory notes issued 3,936      
2028        
Disclosure of financial liabilities [line items]        
Interest payable 979      
Promissory notes issued 2,107      
2029        
Disclosure of financial liabilities [line items]        
Interest payable 888      
Promissory notes issued 2,352      
Subsequent years        
Disclosure of financial liabilities [line items]        
Interest payable 6,932      
Promissory notes issued 17,358      
Sustainable Financing        
Disclosure of financial liabilities [line items]        
Total carrying amount 4,804      
Promissory notes issued 3,050     € 2,600
Borrowings 21,447 18,796    
Derivative instruments        
Disclosure of financial liabilities [line items]        
Current financial assets 461 352    
Non-current financial assets 2,605 1,940    
Sustainability linked bilateral facilities        
Disclosure of financial liabilities [line items]        
Borrowings 4,343      
Undrawn facilities at December 31, 2024 (Note 18) | Sustainable Financing        
Disclosure of financial liabilities [line items]        
Borrowings 10,593      
Sustainability linked facility of Telefonica Germany | Sustainable Financing        
Disclosure of financial liabilities [line items]        
Borrowings 750      
Sustainability linked facilities of Telefónica, S.A. | Sustainable Financing        
Disclosure of financial liabilities [line items]        
Total carrying amount 390      
Borrowings 5,500      
Telefónica, S.A.        
Disclosure of financial liabilities [line items]        
Current financial assets 1,800 1,078    
Total carrying amount 38,782 37,061    
Collateral liabilities deposit 123 € (589)    
Borrowings 32,704      
Telefónica, S.A. | Less than 1 year        
Disclosure of financial liabilities [line items]        
Total carrying amount 5,590      
Borrowings 4,835      
Telefónica, S.A. | 2026        
Disclosure of financial liabilities [line items]        
Total carrying amount 2,607      
Borrowings 2,058      
Telefónica, S.A. | 2027        
Disclosure of financial liabilities [line items]        
Total carrying amount 5,227      
Borrowings 4,022      
Telefónica, S.A. | 2028        
Disclosure of financial liabilities [line items]        
Total carrying amount 2,678      
Borrowings 2,025      
Telefónica, S.A. | 2029        
Disclosure of financial liabilities [line items]        
Total carrying amount 3,280      
Borrowings 2,432      
Telefónica, S.A. | Subsequent years        
Disclosure of financial liabilities [line items]        
Total carrying amount 19,400      
Borrowings 17,332      
Maximum        
Disclosure of financial liabilities [line items]        
Promissory notes issuable, allowed increase 2,000      
Peru        
Disclosure of financial liabilities [line items]        
Total carrying amount € 435      
Latin America        
Disclosure of financial liabilities [line items]        
Proportion of gross debt (as a percent) 1.00%      
Commercial paper        
Disclosure of financial liabilities [line items]        
Promissory notes issued € 1,165      
Average interest rate (as a percent) 3.76% 3.65%    
Promissory note        
Disclosure of financial liabilities [line items]        
Promissory notes issued € 35 € 0    
Average interest rate (as a percent) 3.65%      
Loans and other payables        
Disclosure of financial liabilities [line items]        
Average interest rate (as a percent) 4.71% 4.47%