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Business combinations - Acquisition of mobile assets of Oi Group Narrative (Details)
€ in Millions, client in Millions, R$ in Millions
 12 Months Ended
Apr. 20, 2022
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2022
BRL (R$)
Apr. 20, 2022
sitesOfMobileAccess
Apr. 20, 2022
Apr. 20, 2022
client
Apr. 20, 2022
site
Dec. 31, 2021
EUR (€)
Disclosure of detailed information about business combination [line items]                  
Current financial assets   € 2,444             € 3,835
Deposits and guarantees                  
Disclosure of detailed information about business combination [line items]                  
Current financial assets   439             € 760
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    
Number of clients recognised as of acquisition date, (in percentage of total customers)           0.30      
Spectrum recognised as of acquisition date, percentage of radiofrequency (in percentage)           0.46      
Infrastructure contracts recognised as of acquisition date         2,700     2,700  
Infrastructure contracts recognised as of acquisition date, percentage           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              
Asset recognised for expected reimbursement, contingent liabilities in business combination | R$       353          
Increase in existing liabilities, contingent liabilities recognised in business combination | R$     R$ 3,187            
Increase in existing liabilities, contingent liabilities recognised in business combination, percentage 0.10                
Telefonica Brasil | Oi Group                  
Disclosure of detailed information about business combination [line items]                  
Asset recognised for expected reimbursement, contingent liabilities in business combination   12   R$ 64          
Increase in existing liabilities, contingent liabilities recognised in business combination   204 1,075            
Telefonica Brasil | Guaranteed | Oi Group                  
Disclosure of detailed information about business combination [line items]                  
Increase in existing liabilities, contingent liabilities recognised in business combination   € 93 R$ 488            
Increase in existing liabilities, contingent liabilities recognised in business combination, percentage   0.10 0.10            
Minimum | Oi Group | Licenses                  
Disclosure of detailed information about business combination [line items]                  
Useful life measured as period of time, intangible assets other than goodwill   5 years 5 years            
Maximum | Oi Group | Licenses                  
Disclosure of detailed information about business combination [line items]                  
Useful life measured as period of time, intangible assets other than goodwill   15 years 15 years            
Weighted average [member] | Oi Group | 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 10 years 29 days