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Revenue and Expenses - Other Income (Details) - EUR (€) € in Millions | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jul. 31, 2021 | Jul. 01, 2021
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Own work capitalized |  | € 783 | € 771 | € 873 |  |
Gain on disposal of businesses |  | 205 | 11,008 | 67 |  |
Gain on disposal of property, plant and equipment |  | 582 | 478 | 270 |  |
Gain on disposal of intangible assets |  | 1 | 7 | 6 |  |
Government grants |  | 16 | 13 | 17 |  |
Other operating income |  | 478 | 396 | 354 |  |
Total |  | 2,065 | 12,673 | 1,587 |  |
Capital gains arising from sale and leaseback transactions |  | 381 | 263 | € 79 |  |
Opal Jvco Limited (nexfibre) |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Capital gain (loss) |  | 20 |  |  |  |
VMO2 |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Other operating income | € (4,773) | (7,754) |  |  |  |
Total | € 290 | 551 |  |  |  |
Capital gain (loss) |  |  | 4,460 |  |  |
Telxius Towers |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Capital gain (loss) |  |  | 6,099 |  |  |
InfraCo, SpA |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Proportion of voting equity transferred (as a percent) |  |  |  |  | 60.00% |
Telefonica Moviles Costa Rica |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Capital gain (loss) |  |  | 136 |  |  |
Telefonica Colombia | KKR Alameda Aggregator L.P. | Alamo HoldCo S.L. |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Gains (losses) on disposals of property, plant and equipment |  | € 162 |  |  |  |
Telefónica Chile, S.A. | KKR Alameda Aggregator L.P. | InfraCo, SpA |  |  |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |  |  |
Capital gain (loss) |  |  | € 274 |  |  |
Proportion of voting equity transferred (as a percent) | 60.00% |  | 60.00% |  |  | 60.00%

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