v3.26.1
Additional disclosures - Parent company condensed statements of comprehensive income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Statement of Income Captions [Line Items]      
Profit or loss for the year € 15,500 € 13,744 € 12,183
OTHER RECOGNISED INCOME AND EXPENSE (1,858) (2,339) 614
Items that may be reclassified to profit or loss (1,958) (2,558) 1,578
Hedging instruments (items not designated) (14) 0 0
Revaluation gains (losses) (1) 0 0
Amounts transferred to income statement (13) 0 0
Other reclassifications 0 0 0
Debt instruments at fair value with changes in other comprehensive income 613 (493) 858
Revaluation gains (losses) 715 (447) 852
Amounts transferred to income statement (102) (46) 6
Other reclassifications 0 0 0
Cash flow hedges (effective portion) 867 558 2,592
Revaluation gains (losses) 158 (698) (30)
Amounts transferred to income statement 709 1,256 2,622
Other reclassifications 0 0 0
Hedges of net investments in foreign operations (effective portion) 195 420 (1,888)
Exchange differences (3,399) (3,047) 1,017
Revaluation gains (losses) (3,399) (3,047) 1,009
Amounts transferred to income statement 0 0 8
Other reclassifications 0 0 0
Non-current assets held for sale 274 0 0
Income tax (514) 112 (1,020)
Items that will not be reclassified to profit or loss 100 219 (964)
Actuarial gains and losses on defined benefit pension plans (73) (584) (1,038)
Other recognised income and expense of investments in subsidiaries, joint ventures and associates 1 (3) (5)
Income tax relating to items that will not be reclassified 77 82 361
Total recognised income and expenses for the year 13,642 11,405 12,797
Banco Santander, S.A. | Reportable Legal Entities      
Condensed Statement of Income Captions [Line Items]      
Profit or loss for the year 11,113 10,101 9,239
OTHER RECOGNISED INCOME AND EXPENSE (79) 730 (57)
Items that may be reclassified to profit or loss (101) 305 276
Hedging instruments (items not designated) 283 0 0
Revaluation gains (losses) 283 0 0
Amounts transferred to income statement 0 0 0
Other reclassifications 0 0 0
Debt instruments at fair value with changes in other comprehensive income (27) 28 104
Revaluation gains (losses) 36 (55) 65
Amounts transferred to income statement (63) 84 39
Other reclassifications 0 0 0
Cash flow hedges (effective portion) (100) 409 284
Revaluation gains (losses) (79) 140 (70)
Amounts transferred to income statement (21) 269 354
Amounts transferred to initial carrying amount of hedged items 0 0 0
Other reclassifications 0 0 0
Hedges of net investments in foreign operations (effective portion) 0 0 0
Exchange differences (299) 0 0
Revaluation gains (losses) (299) 0 0
Amounts transferred to income statement 0 0 0
Other reclassifications 0 0 0
Non-current assets held for sale 0 0 0
Income tax 42 (132) (112)
Items that will not be reclassified to profit or loss 21 425 (333)
Actuarial gains and losses on defined benefit pension plans 30 (16) (14)
Other recognised income and expense of investments in subsidiaries, joint ventures and associates 0 0 0
Changes in the fair value of equity instruments measured at fair value through other comprehensive income 100 262 (250)
Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net 0 0 0
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedged item) (76) 20 (31)
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedging instrument) 76 (20) 31
Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk (136) 247 (107)
Income tax relating to items that will not be reclassified 27 (68) 38
Total recognised income and expenses for the year € 11,034 € 10,831 € 9,182