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Payables and Other Current Liabilities - Information on Average Payment Period to Suppliers (Details) - Spain - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Payments to Suppliers [Line Items] |  |
Ratio of payments | 52 days | 53 days
Ratio of outstanding invoices | 39 days | 39 days
Weighted average |  |
Payments to Suppliers [Line Items] |  |
Weighted average maturity period | 51 days | 51 days
Total payments |  |
Payments to Suppliers [Line Items] |  |
Financial liabilities | € 8,424 | € 7,897
Outstanding invoices |  |
Payments to Suppliers [Line Items] |  |
Financial liabilities | € 1,221 | € 1,211

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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of days between invoice date and payment due date for financial liabilities that are part of a supplier finance arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 44H -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_44H_b_iii&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition [Line Items] for Payments to Suppliers [Table] + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Ratio Of Outstanding Invoices + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Ratio Of Payments + References No definition available. + Details
Name: | tef_RatioOfPayments
Namespace Prefix: | tef_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=country_ES
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |