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Interest expense (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Analysis of income and expense [abstract] |  |  |
Customer deposits | € 31,735 | € 35,714 | € 32,457
Debt securities issued and subordinated liabilities | 15,066 | 14,612 | 12,671
Marketable debt securities | 13,580 | 13,255 | 11,661
Subordinated liabilities (note 23) | 1,486 | 1,357 | 1,010
Central banks and credit institution deposits | 8,151 | 9,381 | 9,360
Lease Liabilities | 107 | 122 | 127
Provisions for pensions (note 25) | 91 | 105 | 93
Other interest expense | 4,212 | 5,291 | 6,384
Interest expense | € 59,362 | € 65,225 | € 61,092

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