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Cash Flow Detail - Investing Activities, Proceeds and Payments on Financial Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents € 1,432 € 2,967 € 2,163
Payments on financial investments not included under cash equivalents (1,475) (2,575) (1,474)
Net proceeds/(payments) for temporary financial investments 856 1,532 (1,584)
Collateral guarantees on derivatives      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 1,088 2,891 1,897
Payments on financial investments not included under cash equivalents (1,402) (2,195) (1,228)
Legal deposits      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 31 3 125
Payments on financial investments not included under cash equivalents (16) (4) (7)
Long-term financial instruments of Pegaso PCS (Note 12)      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 287 0 0
Payments on financial investments not included under cash equivalents 0 (260) 0
Others      
Disclosure of associates [line items]      
Proceeds on financial investments not included under cash equivalents 26 73 141
Payments on financial investments not included under cash equivalents (57) (116) (122)
Investment in funds shares of Telefónica Brasil      
Disclosure of associates [line items]      
Payments on financial investments not included under cash equivalents € 0 € 0 € (117)