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Cash Flow Detail - Investing Activities (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash Flow Statement [Abstract] |  |  |
Proceeds from the sale in property, plant and equipment and intangible assets | € 269 | € 310 | € 842
Payments on investments in property, plant and equipment and intangible assets | (5,790) | (6,161) | (6,350)
(Payments on investments)/proceeds from the sale in property, plant and equipment and intangible assets | € (5,521) | € (5,851) | € (5,508)

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- Definition The cash outflow for the purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets. [Refer: Intangible assets other than goodwill; Investment property; Other non-current assets; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
Name: | tef_CashFlowStatementAbstract
Namespace Prefix: | tef_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Proceeds From (Purchase Of) Property, Plant And Equipment And Intangible Assets, Classified As Investing Activities, Net + References No definition available. + Details
Name: | tef_ProceedsFromPurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivitiesNet
Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Sales Of Property, Plant, And Equipment And Intangibles, Classified As Investing Activities + References No definition available. + Details
Name: | tef_ProceedsFromSalesOfPropertyPlantAndEquipmentAndIntangiblesClassifiedAsInvestingActivities
Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration