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Other comprehensive income - Schedule of other comprehensive income, that may be reclassified to profit or loss, by type of instrument and geographical origin of the issuer (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Net revaluation gains/ (losses) | € (372) | € (736) | € (555)
Fair Value | 74,612 | 89,898 | 83,308
Debt securities |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 533 | 584 | 667
Revaluation losses | (905) | (1,320) | (1,222)
Net revaluation gains/ (losses) | (372) | (736) | (555)
Fair Value | 72,331 | 87,705 | 81,547
Issued by Public-sector | Spain |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 118 | 103 | 17
Revaluation losses | 0 | 0 | 0
Net revaluation gains/ (losses) | 118 | 103 | 17
Fair Value | 10,142 | 13,764 | 9,867
Issued by Public-sector | Rest of Europe |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 209 | 268 | 333
Revaluation losses | (36) | (70) | (96)
Net revaluation gains/ (losses) | 173 | 198 | 237
Fair Value | 8,856 | 15,413 | 18,258
Issued by Public-sector | America and rest of the world |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 109 | 76 | 194
Revaluation losses | (528) | (944) | (820)
Net revaluation gains/ (losses) | (419) | (868) | (626)
Fair Value | 31,685 | 38,784 | 38,169
Issued by Private-sector | Spain |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 29 | 96 | 98
Revaluation losses | (53) | (23) | (9)
Net revaluation gains/ (losses) | (24) | 73 | 89
Fair Value | 9,745 | 6,019 | 5,129
Issued by Private-sector | Rest of Europe |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 28 | 25 | 19
Revaluation losses | (15) | (18) | (30)
Net revaluation gains/ (losses) | 13 | 7 | (11)
Fair Value | 6,445 | 7,478 | 5,018
Issued by Private-sector | America and rest of the world |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Revaluation gains | 40 | 16 | 6
Revaluation losses | (273) | (265) | (267)
Net revaluation gains/ (losses) | (233) | (249) | (261)
Fair Value | € 5,458 | € 6,247 | € 5,106

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