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Lease Liabilities - Movement of Lease Liabilities (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Movement of Lease Liabilities [Roll Forward] |  |
Balance at beginning of period | € 8,070 | € 5,294
Additions | 2,487 | 2,030
Sale of the towers division of Telxius |  | 2,650
Principal and Interest Payments of Lease Liabilities | (2,361) | (1,859)
Principal payments (Note 28) | (1,996) | (1,782)
Interests payments (Note 28) | (365) | (246)
Minus: Payments of companies held for sale and sold |  | 169
Disposals | (59) | (288)
Business combinations | 124 | 14
Accrued interests | 393 | 259
Translation differences and hyperinflation adjustments | 246 | 29
Transfers and others | (223) | (59)
Balance at end of period | € 8,677 | 8,070
Accrued interests of lease liabilities including held-for-sale |  | € 274

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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 2022-03-24 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_b&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
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 2022-03-24 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued interests of lease liabilities including held-for-sale + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Accrued Interests of Lease Liabilities + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Addition Of Lease Liabilities, Sale Of Divisions + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Disposals of Lease Liabilities + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Movement of Lease Liabilities [Roll Forward] + References No definition available. + Details
Name: | tef_MovementofLeaseLiabilitiesRollForward
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Balance Type: | na
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- Definition Payments of Companies Held-for-Sale and Sold Companies during Period of Lease Liabilities + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
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- Definition Principal Payments on Leases + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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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Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Translation Differences of Lease Liabilities + References No definition available. + Details
Name: | tef_TranslationDifferencesofLeaseLiabilities
Namespace Prefix: | tef_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration