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Cash Flow Detail - Investing Activities, Proceeds and Payments on Companies (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed € (115) € 13,369 € 81
Payments on investments in companies, net of cash and cash equivalents acquired (1,628) (414) (79)
Grupo Oi Mobile Business      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (986) 0 0
Incremental      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (178) 0 0
BE-terna      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (328) 0 0
Cancom Ltd.      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired 0 (374) 0
UGG TopCo GmbH & Co KG      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (50) (27) 0
Others      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (86) (13) (79)
VMO2      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed (256) 5,872 0
Telxius Towers      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 2 7,434 0
Telxius Towers - Tax      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 0 (917) 0
Telefónica de Costa Rica TC, S.A.      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed (15) 442 0
InfraCo, SpA      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 0 479 0
Tax Associated with Sale of InfraCo, SpA      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed (124) 0 0
Telefónica El Salvador      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 116 0 0
Fiber Assets in Colombia      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 55 0 0
Telfin Ireleand      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 35 35 0
Tax associated with the sales of operating businesses in Guatemala, Nicaragua and Panama in Telefónica Centroamérica Inversiones, S.L.      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed 0 0 71
Others      
Continuing And Discontinued Operations [Line Items]      
(Payments)/proceeds on disposals of companies, net of cash and cash equivalents disposed € 72 € 24 € 10