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Tax Matters - Tax Credits for Loss Carry-Forwards (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | € 5,616 | € 6,416
Ending balance, deferred tax assets | 4,884 | 5,616
Tax loss carryforwards generated in the tax group | 3,825 |
Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 2,639 | 2,741
Additions | 278 | 435
Reversals | (939) | (508)
Perimeter changes | 1 | 2
Translation differences and other | 32 | (31)
Ending balance, deferred tax assets | 2,011 | 2,639
Tax loss carryforwards generated in the tax group | 1,755 |
Spain |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 999 |
Ending balance, deferred tax assets | 457 | 999
Tax loss carryforwards generated in the tax group | 498 |
Spain | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 999 | 1,283
Additions | 58 | 0
Reversals | (600) | (283)
Perimeter changes | 0 | 0
Translation differences and other | 0 | (1)
Ending balance, deferred tax assets | 457 | 999
Germany |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Ending balance, deferred tax assets | 810 |
Tax loss carryforwards generated in the tax group | 5,452 |
Germany | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 778 | 813
Additions | 153 | 150
Reversals | (122) | (184)
Perimeter changes | 1 | 0
Translation differences and other | 0 | (1)
Ending balance, deferred tax assets | 810 | 778
Latin America |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Ending balance, deferred tax assets | 741 |
Tax loss carryforwards generated in the tax group | 683 |
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 | 861 | 645
Additions | 64 | 285
Reversals | (216) | (41)
Perimeter changes | 0 | 0
Translation differences and other | 32 | (28)
Ending balance, deferred tax assets | 741 | 861
Other | Tax credits for loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance, deferred tax assets | 1 | 0
Additions | 3 | 0
Reversals | (1) | 0
Perimeter changes | 0 | 2
Translation differences and other | 0 | (1)
Ending balance, deferred tax assets | 3 | € 1
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 | 2,070 |
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 | 0 |
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 | 143 |
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 | 1,755 |
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 | € 1,927 |

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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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_o&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_56&doctype=Standard -URIDate 2022-03-24 + Details
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