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Other comprehensive income - Schedule of exchange differences included in other comprehensive income that may be reclassified to profit or loss, by currency (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | € (22,375) | € (19,510) |
Balance at end of year | (25,475) | (22,375) | € (19,510)
Movement | 407 | (216) | (22)
Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (22,375) | (19,510) | (20,420)
Balance at end of year | (25,475) | (22,375) | (19,510)
Movement | (3,100) | (2,865) | 910
From goodwill | (287) | (568) | 249
From results | (52) | (295) | 37
From net assets | (2,976) | (2,002) | 624
From transfers | 215 |  |
Brazilian real | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (16,664) | (13,287) | (14,199)
Balance at end of year | (16,755) | (16,664) | (13,287)
Movement | (91) | (3,377) | 912
From goodwill | (13) | (631) | 191
From results | (41) | (206) | 11
From net assets | (37) | (2,540) | 710
From transfers | 0 |  |
Pound sterling | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (3,300) | (4,064) | (4,446)
Balance at end of year | (4,126) | (3,300) | (4,064)
Movement | (826) | 764 | 382
From goodwill | (48) | 39 | 20
From results | (18) | 22 | 4
From net assets | (760) | 703 | 358
From transfers | 0 |  |
Mexican peso | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (1,437) | (64) | (1,132)
Balance at end of year | (1,222) | (1,437) | (64)
Movement | 215 | (1,373) | 1,068
From goodwill | 11 | (82) | 62
From results | 40 | (136) | 41
From net assets | 164 | (1,155) | 965
From transfers | 0 |  |
Argentine peso | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (2,090) | (2,658) | (1,754)
Balance at end of year | (2,216) | (2,090) | (2,658)
Movement | (126) | 568 | (904)
From goodwill | 0 | 0 | (4)
From results | 0 | 0 | 0
From net assets | (126) | 568 | (900)
From transfers | 0 |  |
Chilean peso | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (2,180) | (1,890) | (1,605)
Balance at end of year | (2,249) | (2,180) | (1,890)
Movement | (69) | (290) | (285)
From goodwill | (12) | (34) | (32)
From results | 9 | (7) | (34)
From net assets | (66) | (249) | (219)
From transfers | 0 |  |
US dollar | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | 4,462 | 3,433 | 4,062
Balance at end of year | 2,340 | 4,462 | 3,433
Movement | (2,122) | 1,029 | (629)
From goodwill | (225) | 116 | (64)
From results | (48) | 35 | (16)
From net assets | (1,849) | 878 | (549)
From transfers | 0 |  |
Polish zloty | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (202) | (325) | (776)
Balance at end of year | 18 | (202) | (325)
Movement | 220 | 123 | 451
From goodwill | 1 | 34 | 87
From results | 0 | 5 | 32
From net assets | 4 | 84 | 332
From transfers | 215 |  |
Other currencies | Grupo Santander |  |  |
Items that may be reclassified to profit or loss |  |  |
Balance at beginning of year | (964) | (655) | (570)
Balance at end of year | (1,265) | (964) | (655)
Movement | (301) | (309) | (85)
From goodwill | (1) | (10) | (11)
From results | 6 | (8) | (1)
From net assets | (306) | € (291) | € (73)
From transfers | € 0 |  |

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