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Goodwill - Reconciliation of Goodwill by Group Segment (Details) - Goodwill - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Beginning balance | € 16,519 | € 17,044
Additions | 1,152 | 297
Disposals | 0 | (353)
Write-offs | 0 | (416)
Transfers | (5) | (50)
Exchange rate impact | 805 | (3)
Ending balance | 18,471 | 16,519
Telefónica Spain | Operating segments |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Beginning balance | 4,291 | 4,299
Additions | 0 | 0
Disposals | 0 | (8)
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 | 6,278 | 6,258
Additions | 695 | 0
Disposals | 0 | (36)
Write-offs | 0 | 0
Transfers | 0 | 0
Exchange rate impact | 779 | 56
Ending balance | 7,752 | 6,278
Telefónica Germany | Operating segments |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Beginning balance | 4,386 | 4,558
Additions | 0 | 0
Disposals | 0 | (172)
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 | 1,166 | 1,778
Additions | 0 | 0
Disposals | 0 | (137)
Write-offs | 0 | (393)
Transfers | 0 | (13)
Exchange rate impact | 49 | (69)
Ending balance | 1,215 | 1,166
Others | Operating segments |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Beginning balance | 398 | 151
Additions | 457 | 297
Disposals | 0 | 0
Write-offs | 0 | (23)
Transfers | (5) | (37)
Exchange rate impact | (23) | 10
Ending balance | € 827 | € 398

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- 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 2022-03-24 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease in intangible assets and goodwill resulting from disposals. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2022-03-24 + Details
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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 2022-03-24 -Paragraph 118 -Subparagraph e -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from transfers. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e&doctype=Standard -URIDate 2022-03-24 + Details
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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 -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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