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Cash Flow Detail - Financing Activities, Dividends and Shares (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 31, 2023
Dividends [Line Items]        
Dividends paid € (2,139) € (1,397) € (3,630)  
Proceeds from share capital increase with minority interest 113 1,022 0  
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests (1,771) (555) (604)  
Operations with other equity holders (329) (268) (354)  
Undated deeply subordinated securities        
Dividends [Line Items]        
Operations with other equity holders 1,750 750 1,750  
Acquisition and payment of undated deeply subordinated securities (Note 17) (1,750) (750) (1,750)  
Coupon related to undated deeply subordinated securities        
Dividends [Line Items]        
Payments for equity (329) (268) (354)  
Telefonica Moviles Guatemala & Telefonica Celular de Nicaragua & Telefonica Moviles Panama        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests 0 (44) 0  
Dividends paid by Telefonica, S.A.        
Dividends [Line Items]        
Dividends paid (1,701) (959) (617)  
Non-controlling interests in Telefonica Brasil, S.A.        
Dividends [Line Items]        
Dividends paid (189) (268) (198)  
Non-controlling interests of Telefonica Deutschland        
Dividends [Line Items]        
Dividends paid (157) (161) (165)  
Payments to non-controlling interests of Telxius for the sale of the telecommunications tower divisions (see Note 17.h)        
Dividends [Line Items]        
Dividends paid 0 0 (2,603)  
Payments to non-controlling interests of Telxius Telecom, S.A.        
Dividends [Line Items]        
Dividends paid (76) 0 (42)  
Others        
Dividends [Line Items]        
Dividends paid (16) (9) (5)  
Pontel Participaciones, S.L. Holding company        
Dividends [Line Items]        
Proceeds from share capital increase with minority interest 111 0 0  
Pontel Participaciones, S.L. Holding company | Telxius Telecom, S.A.        
Dividends [Line Items]        
Percentage of voting equity interests acquired       40.00%
Telefonica Brasil, S.A.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests (92) (111) (78)  
Telefonica Deutschland Holding A.G.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests (816) (48) (51)  
Telefonica, S.A.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests (223) (365) (478)  
Telefónica Hispanoamérica, S.A.U. Sociedad holding        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests 23 13 3  
Others        
Dividends [Line Items]        
Proceeds from share capital increase with minority interest 2 1 0  
Bluevia Fibra, S.L. Operations and exploitation of FTTH network and other connectivity services.        
Dividends [Line Items]        
Proceeds from share capital increase with minority interest 0 1,021 0  
KKR Alameda Aggregator L.P.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests (351) 0 0  
KKR Alameda Aggregator L.P. | Telxius Telecom, S.A.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests € (224) 0 0  
Percentage of voting equity interests acquired 4000.00%      
Pontegadea Inversiones, S.L.        
Dividends [Line Items]        
(Payments)/proceeds of treasury shares and other operations with shareholders and with minority interests € (88) € 0 € 0