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Derivative Financial Instruments and Risk Management Policies - Country Risk (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€)
Disclosure of financial liabilities [line items]
Borrowings	€ 27,161
Proportion of net financial debt held (as a percent)	6.50%
Telefonica Hispanoamerica
Disclosure of financial liabilities [line items]
Borrowings	€ 1,768
Net repatriation of funds to Spain	364
Net repatriation of funds from dividends received	377
Net repatriation of funds, fees	266
Net repatriation of funds, loan payments	€ 279

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 24A
-Subparagraph a
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- Definition

Net Repatriation Of Funds

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- Definition

Net Repatriation Of Funds, Dividends

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Net Repatriation Of Funds, Fees

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- Definition

Net Repatriation Of Funds, Offset, Loan Payments

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Percentage Of Net Financial Debt Held

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