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Associates and Joint Ventures - Detail Purchase and Other Commitments Associates and Joint Ventures (Details) € in Millions	Dec. 31, 2024 EUR (€)
Unsere Grüne Glasfaser (UGG)
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	€ 1,425
Unsere Grüne Glasfaser (UGG) | Less than 1 year
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	431
Unsere Grüne Glasfaser (UGG) | 1 to 3 years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	305
Unsere Grüne Glasfaser (UGG) | 3 to 5 years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	275
Unsere Grüne Glasfaser (UGG) | More than five years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	414
Opal Jvco Limited (nexfibre)
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	871
Opal Jvco Limited (nexfibre) | Less than 1 year
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	678
Opal Jvco Limited (nexfibre) | 1 to 3 years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	122
Opal Jvco Limited (nexfibre) | 3 to 5 years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	67
Opal Jvco Limited (nexfibre) | More than five years
Disclosure Of Joint Ventures And Associates [Line Items]
Commitments in relation to joint ventures	€ 4

X

- Definition

The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Total for all joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 23
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_23_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CommitmentsInRelationToJointVentures
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

[Line Items] for Disclosure Of Joint Ventures And Associates [Table]

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_JointVenturesAxis=tef_UnsereGrneGlasfaserGmbHCoKGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_JointVenturesAxis=tef_OpalJvcoLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: