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Basis of Presentation of the Consolidated Financial Statements - Agreement between Telefonica de Espana (Details) € in Millions, R$ in Millions		12 Months Ended
	Dec. 20, 2022 EUR (€)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 EUR (€)	Apr. 20, 2022 EUR (€)	Apr. 20, 2022 BRL (R$)
Disclosure of subsidiaries [line items]
Acquisitions and disposals of non-controlling interests and business combinations (Note 2)		€ (1,579)	€ 781	€ (473)
Deferred tax assets		6,240	4,884	5,616
Deferred tax assets for temporary differences
Disclosure of subsidiaries [line items]
Deferred tax assets		5,586	5,205
Retained earnings
Disclosure of subsidiaries [line items]
Acquisitions and disposals of non-controlling interests and business combinations (Note 2)			936	(354)
Non-controlling interests
Disclosure of subsidiaries [line items]
Acquisitions and disposals of non-controlling interests and business combinations (Note 2)		€ (1,579)	(155)	€ (119)
Bluevia Fibra, S.L. Operations and exploitation of FTTH network and other connectivity services. | Deferred tax assets for temporary differences
Disclosure of subsidiaries [line items]
Deferred tax assets			€ 548			R$ 548
Bluevia Fibra, S.L. Operations and exploitation of FTTH network and other connectivity services. | Retained earnings
Disclosure of subsidiaries [line items]
Acquisitions and disposals of non-controlling interests and business combinations (Note 2)	€ 986
Bluevia Fibra, S.L. Operations and exploitation of FTTH network and other connectivity services. | Non-controlling interests
Disclosure of subsidiaries [line items]
Acquisitions and disposals of non-controlling interests and business combinations (Note 2)	€ 23
Vauban/CAA | Bluevia Fibra, S.L. Operations and exploitation of FTTH network and other connectivity services.
Disclosure of subsidiaries [line items]
Proportion of voting rights held in associate (in percentage)	45.00%
Consideration (share purchase price)					€ 1,021	R$ 1,021

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