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Cash Flow Detail - Investing Activities, Proceeds and Payments on Companies (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed € 1,004 € (115) € 13,369
Payments on investments in companies, net of cash and cash equivalents acquired (252) (1,628) (414)
Grupo Oi Mobile Business      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (3) (986) 0
Incremental      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired 0 (178) 0
BE-terna      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (5) (328) 0
Cancom Ltd.      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired 0 0 (374)
UGG TopCo GmbH & Co KG      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (73) (50) (27)
InfraCo, SpA      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (46) 0 0
InfraCo, SpA - Loan      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (46) 0 0
Opal Jvco Limited (nexfibre)      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (33) 0 0
Others      
Continuing And Discontinued Operations [Line Items]      
Payments on investments in companies, net of cash and cash equivalents acquired (46) (86) (13)
Telxius Towers - Tax      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 876 0 (917)
VMO2      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 (256) 5,872
Telxius Towers      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 90 2 7,434
Telefónica de Costa Rica TC, S.A.      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 (15) 442
InfraCo, SpA      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 0 479
Tax Associated with Sale of InfraCo, SpA      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 (124) 0
Telefónica El Salvador      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 116 0
Fiber Assets in Colombia      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 55 0
Telfin Ireleand      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed 0 35 35
Others      
Continuing And Discontinued Operations [Line Items]      
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed € 38 € 72 € 24