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Business combinations - 2022 Acquisition of mobile assets of Oi Group Narrative (Details)
€ in Millions, client in Millions, R$ in Millions
 12 Months Ended
Oct. 23, 2023
EUR (€)
Oct. 23, 2023
BRL (R$)
Apr. 20, 2022
EUR (€)
client
siteOfMobileAccess
Apr. 20, 2022
BRL (R$)
Dec. 31, 2023
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
BRL (R$)
Apr. 20, 2022
BRL (R$)
client
siteOfMobileAccess
Disclosure of detailed information about business combination [line items]                
Current financial assets         € 1,078 € 1,800    
Deposits and guarantees                
Disclosure of detailed information about business combination [line items]                
Current financial assets         209 € 139    
Telefónica Brasil, Claro S.A. And TIM S.A. | Deposits and guarantees                
Disclosure of detailed information about business combination [line items]                
Current financial assets         94   R$ 522  
Oi Group                
Disclosure of detailed information about business combination [line items]                
Number of clients recognised as of acquisition date | client     12.5         12.5
Number of clients recognised as of acquisition date, (in percentage of total customers)     0.30         0.30
Spectrum recognised as of acquisition date, percentage of radiofrequency (in percentage)     0.46         0.46
Infrastructure contracts recognised as of acquisition date | siteOfMobileAccess     2,700         2,700
Infrastructure contracts recognised as of acquisition date, percentage     19         19
Fair value of acquired receivables     € 74          
Gross contractual amounts receivable for acquired receivables     81          
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables     7          
Contingent liabilities recognised as of acquisition date     90          
Revenue of acquiree since acquisition date         206      
Loss of acquiree since acquisition date         € 1      
Consideration   R$ 5,129 1,093         R$ 5,492
Cash transferred, estimation     € 1,063 R$ 5,373        
Retained amount, percentage   50.00%            
Cash transferred, retained amount | R$   R$ 488            
Withdrawn amount, percentage   50.00%            
Withdrawn amount € 51 R$ 277            
Oi Group | Minimum | Licenses                
Disclosure of detailed information about business combination [line items]                
Useful life measured as period of time, intangible assets other than goodwill         5 years      
Oi Group | Maximum | Licenses                
Disclosure of detailed information about business combination [line items]                
Useful life measured as period of time, intangible assets other than goodwill         15 years      
Oi Group | Weighted average | Licenses                
Disclosure of detailed information about business combination [line items]                
Useful life measured as period of time, intangible assets other than goodwill         10 years 29 days