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Cash Flow Detail - Investing Activities, Proceeds and Payments on Companies (Details) € in Millions, R$ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2024 EUR (€) | Oct. 01, 2024 BRL (R$) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | € 220 | € 1,004 | € (115)
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | (189) | (252) | (1,628)
Oi mobile assets acquisition (Note 2) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | 0 | (3) | (986)
Incremental acquisition (Note 5) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | 0 | 0 | (178)
BE-terna acquisition (Note 5) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | 0 | (5) | (328)
IPNET acquisition (Note 5) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired | € (10) | R$ (60) | (10) | 0 | 0
Capital increase of UGG TopCo (Note 10) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | (91) | (73) | (50)
Capital increase of InfraCo Chile (Note 10) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | (6) | (46) | 0
Loan to InfraCo Chile (Note 12) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | 0 | (46) | 0
Loan to InfraCo Chile (Note 12) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | (38) | (33) | 0
Others |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Payments on investments in companies, net of cash and cash equivalents acquired |  |  | (44) | (46) | (86)
Tax associated with the sale of the tower division of Telxius |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 0 | 876 | 0
Constitution of VMO2 |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 0 | 0 | (256)
Sale of Telecommunications towers divisions of Telxius |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 48 | 90 | 2
Tax associated with the sale of InfraCo |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 0 | 0 | (124)
Sale of Telefónica Móviles El Salvador |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 0 | 0 | 116
Sale of fiber assets of Colombia Telecomunicaciones |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 8 | 0 | 55
Deferred collection sale of T. Ireland |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 0 | 0 | 35
Sale of China Unicom shares (Note 12) |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | 147 | 0 | 0
Others |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |
Proceeds/(payments) on disposals of companies, net of cash and cash equivalents disposed |  |  | € 17 | € 38 | € 57

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