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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

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