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Goodwill - Reconciliation of Goodwill by Group Segment (Details) - Goodwill (Note 7) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	€ 18,471	€ 16,519
Additions	16	1,152
Disposals	0	0
Write-offs	(58)	0
Transfers	(36)	(5)
Exchange rate impact	315	805
Ending balance	18,708	18,471
Telefónica Spain | Operating segments
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	4,291	4,291
Additions	0	0
Disposals	0	0
Write-offs	0	0
Transfers	0	0
Exchange rate impact	0	0
Ending balance	4,291	4,291
Telefónica Brazil | Operating segments
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	7,752	6,278
Additions	5	695
Disposals	0	0
Write-offs	0	0
Transfers	0	0
Exchange rate impact	319	779
Ending balance	8,076	7,752
Telefónica Germany | Operating segments
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	4,386	4,386
Additions	0	0
Disposals	0	0
Write-offs	0	0
Transfers	0	0
Exchange rate impact	0	0
Ending balance	4,386	4,386
Telefónica Hispam | Operating segments
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	1,215	1,166
Additions	0	0
Disposals	0	0
Write-offs	(58)	0
Transfers	(36)	0
Exchange rate impact	(13)	49
Ending balance	1,108	1,215
Others | Operating segments
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning balance	827	398
Additions	11	457
Disposals	0	0
Write-offs	0	0
Transfers	0	(5)
Exchange rate impact	9	(23)
Ending balance	€ 847	€ 827

X

- Definition

The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 38
-IssueDate 2023-01-01
-Paragraph 118
-Subparagraph e
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- Definition

The decrease in intangible assets and goodwill resulting from disposals. [Refer: Intangible assets and goodwill]

+ References

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-Name IAS
-Number 38
-IssueDate 2023-01-01
-Paragraph 118
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- Definition

The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 38
-IssueDate 2023-01-01
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-Paragraph 118
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- Definition

The increase (decrease) in intangible assets and goodwill resulting from transfers. [Refer: Intangible assets and goodwill]

+ References

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- Definition

The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2023-01-01
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
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