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Lease Liabilities - Movement of Lease Liabilities (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Movement of Lease Liabilities [Roll Forward] |  |
Balance at beginning of period | € 8,947 | € 8,677
Additions | 2,082 | 2,382
Principal and interests payments | (2,647) | (2,559)
Principal payments (Note 28) | (2,143) | (2,114)
Interests payments | (504) | (445)
Disposals | (70) | (138)
Business combinations | 2 |
Accrued interests | 512 | 435
Translation differences and inflation adjustments | (531) | 62
Transfers and others | 4 | 88
Balance at end of period | 8,303 | 8,947
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Lease liabilities | 8,303 | 8,947
Cumulative Effect, Period of Adoption, Adjustment |  |
Movement of Lease Liabilities [Roll Forward] |  |
Balance at beginning of period | € 4 |
Balance at end of period |  | 4
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Lease liabilities |  | € 4

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition Accrued Interests of Lease Liabilities + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Additions to Lease Liabilities + References No definition available. + Details
Name: | tef_AdditionstoLeaseLiabilities
Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition [Line Items] for Disclosure of finance lease and operating lease by lessee [Table] + References No definition available. + Details
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- Definition Disposals of Lease Liabilities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Movement of Lease Liabilities [Roll Forward] + References No definition available. + Details
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- Definition Principal Payments on Leases + References No definition available. + Details
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Balance Type: | debit
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- Definition Principal and Interest Payments of Lease Liabilities + References No definition available. + Details
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- Definition Registration Of Companies, Lease Liabilities + References No definition available. + Details
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- Definition Transfers and Others of Lease Liabilities + References No definition available. + Details
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- Definition Translation Differences And Inflation Adjustments of Lease Liabilities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Details
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Period Type: |