| Disclosure of Accumulated Other Comprehensive Income [Text Block] |
Accumulated other comprehensive income (loss) The breakdown of the balance under this heading in the consolidated balance sheets is as follows: | | | | | | | | | | | | | | | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). BREAKDOWN BY CONCEPTS (MILLIONS OF EUROS) | | | | | | | Notes | 2025 | 2024 | 2023 | | Items that will not be reclassified to profit or loss | | (2,505) | (1,988) | (2,105) | Actuarial gains (losses) on defined benefit pension plans | | (1,396) | (1,067) | (1,049) | | | | | | Fair value changes of equity instruments measured at fair value through other comprehensive income | 13.4 | (983) | (905) | (1,112) | | | | | | | | | | | | | | | | Fair value changes of financial liabilities at fair value through profit or loss attributable to changes in their credit risk | | (127) | (17) | 55 | | Items that may be reclassified to profit or loss | | (16,366) | (15,232) | (14,148) | Hedge of net investments in foreign operations (effective portion) | | (3,117) | (2,329) | (2,498) | | | | | | Mexican peso | | (3,454) | (2,697) | (3,147) | Turkish lira | | 368 | 394 | 670 | Other exchanges | | (31) | (25) | (21) | Foreign currency translation | | (13,340) | (12,702) | (11,419) | | | | | | Mexican peso | | (3,139) | (3,644) | (640) | Turkish lira | | (6,625) | (5,835) | (6,908) | Argentine peso | | (832) | (555) | (1,296) | Venezuelan bolivar | | (1,910) | (1,865) | (1,865) | Other exchanges | | (834) | (803) | (711) | Hedging derivatives. Cash flow hedges (effective portion) | | 311 | 370 | 133 | Fair value changes of debt instruments measured at fair value through other comprehensive income | 13.4 | (209) | (576) | (357) | Hedging instruments (non-designated items) | | (4) | — | — | Share of other recognized income and expense of investments in joint ventures and associates | | (7) | 5 | (8) | Total | | (18,871) | (17,220) | (16,254) |
The balances recognized under these headings are presented net of tax. The main changes in 2025 are explained by the depreciation against the euro of some of the currencies of the main geographical areas where the Group operates against the euro, mainly the Turkish lira (27%) and the Argentine peso (37%), and the application of IAS 29 "Financial Reporting in Hyperinflationary Economies" in Turkey and Argentina (see Note 2.2.18).
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