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Lease Liabilities - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions related to fixed asset sale and leaseback transactions	€ 12	€ 21
Capital gains arising from sale and leaseback transactions	17	105	€ 381
Telefónica Germany
Disclosure of finance lease and operating lease by lessee [Line Items]
Lease liabilities not yet commenced	€ 2,606	€ 1,117

X

- Definition

The gains (losses) arising from sale and leaseback transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_i&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- Definition

Additions to Lease Liabilities related to Fixed Asset Sale and Leaseback Transaction

+ References

No definition available.

+ Details

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Namespace Prefix:	tef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

[Line Items] for Disclosure of finance lease and operating lease by lessee [Table]

+ References

No definition available.

+ Details

Name:	tef_DisclosureoffinanceleaseandoperatingleasebylesseeLineItems
Namespace Prefix:	tef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exposure Arising From Leases Not Yet Commenced To Which Lessee Is Committed

+ References

No definition available.

+ Details

Name:	tef_ExposureArisingFromLeasesNotYetCommencedToWhichLesseeIsCommitted
Namespace Prefix:	tef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_SegmentsAxis=tef_TelefonicaGermanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: