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Equity - Treasury Shares Instruments Narrative (Details) - EUR (€) € in Millions, shares in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |
Purchase of treasury shares | € 145 | € 223 | € 365
Derivative financial instrument notional shares equivalent | 173 | 193 |

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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Derivative Financial Instrument Shares Equivalent + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Share capital, reserves and other equity interest [Abstract] + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:stringItemType
Balance Type: | na
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