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Events after the Reporting Period - Narrative (Details)
€ in Millions
1 Months Ended 12 Months Ended
Feb. 05, 2024
EUR (€)
Jan. 26, 2024
shares
Jan. 22, 2024
EUR (€)
shares
Jan. 19, 2024
EUR (€)
matchday
Jan. 03, 2024
EUR (€)
yr
worker
Dec. 28, 2023
worker
model
Dec. 28, 2023
yr
worker
Dec. 13, 2021
EUR (€)
matchday
Jul. 02, 2020
EUR (€)
Jan. 26, 2024
EUR (€)
shares
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Jan. 17, 2024
EUR (€)
tranche
Entity Information [Line Items]                            
Number of workers | worker           3,420 3,420              
Minimum age of employees (in years)           56 56              
Minimum seniority of employees (in years) | yr             15              
Expense of restructuring activities                     € 1,320      
Contractual limit amount                     81,097 € 83,706    
Notes and debentures issued                     29,779      
Number of exclusive football match rights | matchday       5       5            
Number of first picks | matchday               18            
Number of second picks | matchday               17            
Broadcasting award price per season               € 520 € 325   320      
Repayments of bonds, notes and debentures                     1,910 € 3,541 € 5,847  
Telefónica Emisiones, S.A.U.                            
Entity Information [Line Items]                            
Repayments of bonds, notes and debentures € 1,000                          
Structured Financing Due January 13, 2029 | Telefonica, S.A.                            
Entity Information [Line Items]                            
Contractual limit amount                     € 5,500      
Collective Bargaining Agreement                            
Entity Information [Line Items]                            
Number of workers | worker         3,420                  
Minimum age of employees (in years) | yr         56                  
Minimum seniority of employees (in years) | yr         15                  
Expense of restructuring activities         € 1,320                  
Issuance Of Notes | Telefonica Emisiones EMTN Bond | January 24 | Telefónica Emisiones, S.A.U.                            
Entity Information [Line Items]                            
Notes and debentures issued                           € 1,750
Number of tranches | tranche                           2
Issuance Of Notes | Telefonica Emisiones EMTN Bond | January 24, 2032 | Telefónica Emisiones, S.A.U.                            
Entity Information [Line Items]                            
Notes and debentures issued                           € 1,000
Issuance Of Notes | Telefonica Emisiones EMTN Bond | January 24, 2032 | Telefónica Emisiones, S.A.U. | Fixed interest rate                            
Entity Information [Line Items]                            
Annual  Fix                                3.698%
Issuance Of Notes | Telefonica Emisiones EMTN Bond | January 24, 2036 | Telefónica Emisiones, S.A.U.                            
Entity Information [Line Items]                            
Notes and debentures issued                           € 750
Issuance Of Notes | Telefonica Emisiones EMTN Bond | January 24, 2036 | Telefónica Emisiones, S.A.U. | Fixed interest rate                            
Entity Information [Line Items]                            
Annual  Fix                                4.055%
Award Of Exclusive Broadcasting Rights                            
Entity Information [Line Items]                            
Number of exclusive football match rights | matchday       5                    
Number of first picks | matchday       18                    
Number of second picks | matchday       17                    
Number of match day, exclusive broadcasting rights | matchday       1                    
Broadcasting award price, 2024/2025 season       € 250                    
Broadcasting award price per season       € 520                    
Voluntary Public Acquisition Offer | Telefónica Deutschland Holding A.G.                            
Entity Information [Line Items]                            
Acquisitions (shares) | shares     233,732,773             113,999,566        
Percentage of voting equity interests acquired     7.86%                      
Number of shares (in shares) | shares   2,799,576,769               2,799,576,769        
Proportion of voting rights held in associate (in percentage)   94.12%                        
Consideration paid (received)     € 549             € 268