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Debt securities - Disclosure of detailed information about debt instruments explanatory (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Instruments |  |  |  |
Financial assets held for trading | € 252,318 | € 230,253 | € 176,921 |
Non-trading financial assets mandatorily at fair value through profit or loss | 7,761 | 6,130 | 5,910 |
Financial assets at fair value through other comprehensive income | 74,612 | 89,898 | 83,308 |
Financial assets at amortised cost | 1,202,689 | 1,203,707 | 1,191,403 |
Total financial assets | 300,026 | 283,497 | 243,203 |
Debt securities |  |  |  |
Debt Instruments |  |  |  |
Financial assets held for trading | 98,568 | 82,646 | 62,124 |
Non-trading financial assets mandatorily at fair value through profit or loss | 245 | 447 | 860 |
Financial assets designated at fair value through profit or loss | 2,894 | 2,897 | 3,095 |
Financial assets at fair value through other comprehensive income | 58,305 | 76,558 | 73,565 |
Financial assets at amortised cost | 140,014 | 120,949 | 103,559 |
Total financial assets | 300,026 | 283,497 | 243,203 |
Gross carrying amount | Debt securities |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 300,546 | 283,846 | 243,489 |
Gross carrying amount | Debt securities | Financial instruments credit-impaired |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 842 | 701 | 461 |
Gross carrying amount | Debt securities | Euro |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 142,969 | 118,456 | 90,857 |
Gross carrying amount | Debt securities | Pound sterling |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 14,114 | 15,630 | 9,284 |
Gross carrying amount | Debt securities | US dollar |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 50,671 | 48,189 | 38,161 |
Gross carrying amount | Debt securities | Brazilian real |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 48,231 | 44,432 | 46,190 |
Gross carrying amount | Debt securities | Other currencies |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 44,561 | 57,139 | 58,997 |
Gross carrying amount | Spanish government debt securities |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 63,742 | 56,919 | 40,321 |
Gross carrying amount | Foreign government debt securities |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 172,468 | 164,747 | 145,732 |
Gross carrying amount | Issued by financial institutions |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 17,465 | 16,776 | 14,681 |
Gross carrying amount | Other fixed-income securities |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | 46,029 | 44,703 | 42,294 |
Accumulated impairment |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | (520) | (349) | (286) |
Accumulated impairment | Debt securities |  |  |  |
Debt Instruments |  |  |  |
Total financial assets | € (520) | € (349) | € (286) | € (226)

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