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Other comprehensive income - Schedule of components of other comprehensive income (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Other Comprehensive Income [Abstract] |  |  |
OTHER COMPREHENSIVE INCOME OR LOSS | € (37,974) | € (36,595) | € (35,020)
ITEMS THAT WILL NOT BE RECLASSIFIED TO PROFIT OR LOSS: | (4,121) | (4,757) | (5,212)
Actuarial gains and losses on defined benefit pension plans | (3,896) | (4,404) | (4,324)
Non-current assets held for sale | 56 | 0 | 0
Share in other income and expenses recognised in investments, joint ventures and associates | 1 | (1) | 1
Other valuation adjustments | 0 | 0 | 0
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income | (250) | (432) | (776)
Inefficiency of fair value hedges of equity instruments measured at fair value with changes in other comprehensive income | 0 | 0 | 0
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (hedged item) | 208 | 284 | 264
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (hedging instrument) | (208) | (284) | (264)
Changes in the fair value of financial liabilities measured at fair value through profit or loss attributable to changes in credit risk | (32) | 80 | (113)
ITEMS THAT MAY BE RECLASSIFIED TO PROFIT OR LOSS: | (33,853) | (31,838) | (29,808)
Hedges of net investments in foreign operations (Effective portion) | (7,343) | (8,002) | (8,684)
Exchange differences | (25,475) | (22,375) | (19,510)
Hedging derivatives. Cash flow hedges (Effective portion) | 333 | (298) | (740)
Changes in the fair value of debt instruments measured at fair value with changes in other comprehensive income | (372) | (736) | (555)
Hedging instruments (items not designated) | (11) | 0 | 0
Non-current assets classified as held for sale | (590) | 0 | 0
Share in other income and expenses recognised in investments, joint ventures and associates | € (395) | € (427) | € (319)

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