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Tax Matters - Tax Credits for Loss Carry-Forwards (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | € 6,240 | € 4,884
Ending balance, deferred tax assets | 6,673 | 6,240
Tax loss carryforwards generated in the tax group | 5,426 |
Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 2,803 | 2,011
Additions | 552 | 1,047
Reversals | (391) | (311)
Translation differences and other | (87) | 56
Ending balance, deferred tax assets | 2,877 | 2,803
Tax loss carryforwards generated in the tax group | 3,439 |
Spain |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 1,110 |
Ending balance, deferred tax assets | 1,277 | 1,110
Tax loss carryforwards generated in the tax group | 113 | 77
Spain | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 1,110 | 457
Additions | 183 | 725
Reversals | (17) | (75)
Translation differences and other | 1 | 3
Ending balance, deferred tax assets | 1,277 | 1,110
Germany |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 879 |
Ending balance, deferred tax assets | 970 | 879
Tax loss carryforwards generated in the tax group | 5,168 | 5,295
Germany | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 879 | 810
Additions | 234 | 189
Reversals | (144) | (120)
Translation differences and other | 1 | 0
Ending balance, deferred tax assets | 970 | 879
Latin America |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 814 |
Ending balance, deferred tax assets | 630 | 814
Tax loss carryforwards generated in the tax group | 797 | 841
Latin America | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 814 | 741
Additions | 135 | 133
Reversals | (230) | (113)
Translation differences and other | (89) | 53
Ending balance, deferred tax assets | 630 | 814
Other | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 0 | 3
Additions | 0 | 0
Reversals | 0 | (3)
Translation differences and other | 0 | 0
Ending balance, deferred tax assets | 0 | € 0
Telefónica Spain | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax loss carryforwards generated in the tax group | 1,987 |
Less than 1 year | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax loss carryforwards generated in the tax group | 868 |
Less than 1 year | Telefónica Spain | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax loss carryforwards generated in the tax group | 0 |
More than 1 year | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax loss carryforwards generated in the tax group | 2,571 |
More than 1 year | Telefónica Spain | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax loss carryforwards generated in the tax group | € 1,987 |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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