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Intangible Assets - Composition and Movements in Net Intangible Assets (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | € 11,370 | € 12,017 |
Additions | 1,796 | 1,838 |
Amortization | (2,462) | (2,583) | € (2,599)
Disposals |  | (2) |
Impairments | (506) | (2) |
Transfers and others | 44 | 50 |
Transla-tion differen-ces | (806) | (183) |
Inflation adjustments | 409 | 223 |
Business combina-tions | 22 |  |
Ending balance | 9,875 | 11,370 | 12,017
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 8 |  |
Service concession arrangements and licenses |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 6,886 | 7,550 |
Additions | 157 | 183 |
Amortization | (757) | (840) |
Disposals |  | 0 |
Impairments | (485) | 0 |
Transfers and others | 1 | 2 |
Transla-tion differen-ces | (536) | (205) |
Inflation adjustments | 376 | 196 |
Business combina-tions | 21 | 0 |
Ending balance | 5,667 | 6,886 | 7,550
Service concession arrangements and licenses | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 4 |  |
Software |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 3,089 | 2,800 |
Additions | 510 | 486 |
Amortization | (1,410) | (1,356) |
Disposals |  | (1) |
Impairments | (21) | 0 |
Transfers and others | 1,139 | 1,122 |
Transla-tion differen-ces | (222) | 18 |
Inflation adjustments | 29 | 20 |
Business combina-tions |  | 0 |
Ending balance | 3,104 | 3,089 | 2,800
Software | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 4 |  |
Software |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Business combina-tions | (14) |  |
Customer base |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 386 | 721 |
Additions | 0 | 0 |
Amortization | (238) | (333) |
Disposals |  | 0 |
Impairments | 0 | 0 |
Transfers and others | 0 | (3) |
Transla-tion differen-ces | (1) | 4 |
Inflation adjustments | (1) | 0 |
Business combina-tions | 5 |  |
Ending balance | 151 | 386 | 721
Customer base | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 0 |  |
Customer base |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Business combina-tions |  | (3) |
Trademarks |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 235 | 263 |
Additions | 0 | 0 |
Amortization | (32) | (33) |
Disposals |  | 0 |
Impairments | 0 | 0 |
Transfers and others | 0 | 0 |
Transla-tion differen-ces | (18) | 5 |
Inflation adjustments | 0 | 0 |
Business combina-tions | 2 | 0 |
Ending balance | 187 | 235 | 263
Trademarks | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 0 |  |
Other intangible assets |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 58 | 39 |
Additions | 20 | 20 |
Amortization | (25) | (21) |
Disposals |  | 0 |
Impairments | 0 | (2) |
Transfers and others | 8 | 5 |
Transla-tion differen-ces | (1) | 2 |
Inflation adjustments | 0 | 0 |
Business combina-tions | 4 | 15 |
Ending balance | 64 | 58 | 39
Other intangible assets | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | 0 |  |
Intangible assets in process |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 716 | 644 |
Additions | 1,109 | 1,149 |
Amortization | 0 | 0 |
Disposals |  | (1) |
Impairments | 0 | 0 |
Transfers and others | (1,104) | (1,076) |
Transla-tion differen-ces | (28) | (7) |
Inflation adjustments | 5 | 7 |
Business combina-tions | 4 | 0 |
Ending balance | 702 | 716 | € 644
Intangible assets in process | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
First applica-tion of IAS 21 | € 0 |  |
Intangible assets other than goodwill, netting |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Business combina-tions |  | € 12 |

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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