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Basis of Presentation of the Consolidated Financial Statements - Schedule of Gain on Sale of Disposal Group (Details) - EUR (€)
€ in Millions
7 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 01, 2021
May 07, 2020
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint ventures [line items]              
Result of the transaction: gain         € 24 € 205 € 11,008
VMO2              
Disclosure of joint ventures [line items]              
Fair value of 50% of VMO2 (Note 10)         € 7,734 € 10,718  
Proportion of ownership interest in joint venture (as a percent) 50.00%     50.00% 50.00%    
Telefónica O2 Holdings Ltd. Holding company              
Disclosure of joint ventures [line items]              
Result of the transaction: gain   € 4,460          
Cash received   6,234          
Fair value of 50% of VMO2 (Note 10)   12,012          
Less: carrying amount of Telefonica United Kingdom at June 1, 2021   (10,937)          
Liabilities assumed and other costs (see Note 29.c)   (441)          
Result before reclassification of translation differences and gains on hedges   6,868          
Reclassification of translation differences included in equity   (3,135)          
Reclassification of gains on hedges included in equity   € 727          
Telefónica O2 Holdings Ltd. Holding company | VMO2              
Disclosure of joint ventures [line items]              
Proportion of ownership interest in joint venture (as a percent)   50.00% 50.00%