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Associates and Joint Ventures - Breakdown of Key Financial Highlights (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Joint Ventures And Associates [Line Items]        
Other non-current assets € 2,064 € 2,067    
Non-current assets 78,133 83,568    
Cash and cash equivalents 8,062 7,151 € 7,245 € 8,580
Other current assets 2,881 2,702    
Current assets 22,369 20,756    
Total assets 100,502 104,324    
Non-current financial liabilities (33,192) (33,360)    
Other non current liabilities (1,843) (1,692)    
Non current liabilities (52,019) (53,829)    
Current financial liabilities (5,590) (3,701)    
Other current liabilities (1,966) (1,819)    
Current liabilities (25,734) (23,399)    
Purchase price allocation        
Group’s share in equity 22,749 27,096 31,708 € 28,684
Goodwill 16,461 18,708    
Carrying amount in the Telefónica Group 232 325    
HoldCo Infraco SpA. (Onnet Fibra Chile)        
Purchase price allocation        
Assets 159 178    
Liabilities (43) (48)    
Fair value of net assets € 116 € 130    
Proportion of holding (in percentage) 40.00% 40.00%    
Group’s share in equity € 89 € 120    
Other adjustments 30   30  
Carrying amount in the Telefónica Group 119 150    
Movistar Prosegur Alarmas        
Purchase price allocation        
Assets 42 76    
Liabilities (11) (20)    
Fair value of net assets € 31 € 56    
Proportion of holding (in percentage) 50.00% 50.00%    
Group’s share in equity € 15 € 32    
Goodwill 198 198    
Carrying amount in the Telefónica Group € 213 € 230    
Unsere Grüne Glasfaser (UGG)        
Purchase price allocation        
Proportion of holding (in percentage) 50.00% 50.00%    
Group’s share in equity € 55 € 49    
Other adjustments 49 49    
Carrying amount in the Telefónica Group € 104 € 97    
Opal Jvco Limited (nexfibre)        
Purchase price allocation        
Proportion of holding (in percentage) 25.00% 25.00%    
Group’s share in equity € 90 € 51    
Other adjustments 4   € 4  
Carrying amount in the Telefónica Group 94 55    
Movistar Prosegur Alarmas        
Disclosure Of Joint Ventures And Associates [Line Items]        
Fixed assets 204 172    
Other non-current assets 141 160    
Non-current assets 345 332    
Cash and cash equivalents 1 1    
Other current assets 102 58    
Current assets 103 59    
Total assets 448 391    
Non-current financial liabilities (205) (175)    
Other non current liabilities (78) (63)    
Non current liabilities (283) (238)    
Current financial liabilities (100) (102)    
Other current liabilities (65) (43)    
Current liabilities (165) (145)    
Total allocated liabilities (448) (383)    
Net assets 0 8    
Unsere Grüne Glasfaser (UGG)        
Disclosure Of Joint Ventures And Associates [Line Items]        
Fixed assets 1,344 438    
Other non-current assets 194 211    
Non-current assets 1,538 649    
Cash and cash equivalents 282 49    
Other current assets 63 50    
Current assets 345 99    
Total assets 1,883 748    
Non-current financial liabilities (1,493) (522)    
Other non current liabilities (43) (36)    
Non current liabilities (1,536) (558)    
Current financial liabilities (4) (5)    
Other current liabilities (232) (88)    
Current liabilities (236) (93)    
Total allocated liabilities (1,772) (651)    
Net assets 111 97    
Opal Jvco Limited (nexfibre)        
Disclosure Of Joint Ventures And Associates [Line Items]        
Fixed assets 1,833 840    
Other non-current assets 185 98    
Non-current assets 2,018 938    
Cash and cash equivalents 37 23    
Other current assets 62 54    
Current assets 99 77    
Total assets 2,117 1,015    
Non-current financial liabilities (1,453) (593)    
Other non current liabilities (3) 0    
Non current liabilities (1,456) (593)    
Current financial liabilities (100) (61)    
Other current liabilities (199) (157)    
Current liabilities (299) (218)    
Total allocated liabilities (1,755) (811)    
Net assets 362 204    
HoldCo Infraco SpA. (Onnet Fibra Chile)        
Disclosure Of Joint Ventures And Associates [Line Items]        
Non-current assets 1,343 857    
Cash and cash equivalents 11 27    
Other current assets 84 182    
Current assets 95 209    
Total assets 1,438 1,066    
Non-current financial liabilities (892) (521)    
Other non current liabilities (304) (293)    
Non current liabilities (1,196) (814)    
Current financial liabilities (34) (3)    
Other current liabilities (102) (78)    
Current liabilities (136) (81)    
Total allocated liabilities (1,332) (895)    
Net assets € 106 € 171