Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B67
-Subparagraph d
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B
-URIDate 2023-03-23

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The amount of impairment loss or reversal of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss; Trade receivables]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

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The amount of miscellaneous other operating expenses. [Refer: Other operating income (expense)]

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 102
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_102&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 99
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard
-URIDate 2023-03-23

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Balance Type:	debit
Period Type:	duration

The amount of expense recognised on rental activities.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The amount of expense arising from services.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of tax expense exclusive of income tax expense.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Increase (Decrease) In Tax Expense Due To Decisions With Tax Authorities

No definition available.

Name:	tef_IncreaseDecreaseInTaxExpenseDueToDecisionsWithTaxAuthorities
Namespace Prefix:	tef_
Data Type:	xbrli:monetaryItemType
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Loss On Disposal Of Fixed Assets And Changes In Provisions For Fixed Assets

No definition available.