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Revenue and Expenses - Other Income Narrative (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Continuing And Discontinued Operations [Line Items]
Other operating income	€ 625		€ 428	€ 478
Gain on disposal of businesses	47		24	205
Capital gains arising from sale and leaseback transactions	17		105	€ 381
Colombia Telecomunicaciones S.A. ESP BIC And Colombia Móvil S.A. ESP
Continuing And Discontinued Operations [Line Items]
Gain on disposal of businesses	47
Opal Jvco Limited (nexfibre)
Continuing And Discontinued Operations [Line Items]
Capital gain (loss)			20
Republic of Colombia
Continuing And Discontinued Operations [Line Items]
Other operating income	€ 358	$ 380
Telefonica Colombia | KKR Alameda Aggregator L.P. | Alamo HoldCo S.L. (Onnet Fibra Colombia)
Continuing And Discontinued Operations [Line Items]
Gains (losses) on disposals of property, plant and equipment			€ 162

X

- Definition

The gains (losses) arising from sale and leaseback transactions.

+ References

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The gains (losses) on disposals of property, plant and equipment. [Refer: Property, plant and equipment]

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- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

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[Line Items] for Continuing And Discontinued Operations [Table]

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