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Marketable debt securities - Disclosure of maturity analysis of debt instruments, notional amounts (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Marketable debt securities |  |  |
Notional amount | € 505,992 | € 511,727 | € 418,294
3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 120,662 | 145,627 | 112,546
More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 48,445 | € 43,894 | € 28,309
Marketable debt securities | Debt securities issued |  |  |
Marketable debt securities |  |  |
Notional amount | 319,932 |  |
Marketable debt securities | Debt securities issued | Within 3 months |  |  |
Marketable debt securities |  |  |
Notional amount | 38,803 |  |
Marketable debt securities | Debt securities issued | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 48,596 |  |
Marketable debt securities | Debt securities issued | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Notional amount | 95,699 |  |
Marketable debt securities | Debt securities issued | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 64,614 |  |
Marketable debt securities | Debt securities issued | More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 72,220 |  |
Marketable debt securities | Subordinated debt |  |  |
Marketable debt securities |  |  |
Notional amount | 27,715 |  |
Marketable debt securities | Subordinated debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Notional amount | 0 |  |
Marketable debt securities | Subordinated debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 790 |  |
Marketable debt securities | Subordinated debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Notional amount | 1,744 |  |
Marketable debt securities | Subordinated debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 2,255 |  |
Marketable debt securities | Subordinated debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 22,926 |  |
Marketable debt securities | Senior unsecured debt |  |  |
Marketable debt securities |  |  |
Notional amount | 143,457 |  |
Marketable debt securities | Senior unsecured debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Notional amount | 10,056 |  |
Marketable debt securities | Senior unsecured debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 12,654 |  |
Marketable debt securities | Senior unsecured debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Notional amount | 50,189 |  |
Marketable debt securities | Senior unsecured debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 34,089 |  |
Marketable debt securities | Senior unsecured debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 36,469 |  |
Marketable debt securities | Senior secured debt |  |  |
Marketable debt securities |  |  |
Notional amount | 107,244 |  |
Marketable debt securities | Senior secured debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Notional amount | 11,038 |  |
Marketable debt securities | Senior secured debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 12,110 |  |
Marketable debt securities | Senior secured debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Notional amount | 43,467 |  |
Marketable debt securities | Senior secured debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 28,116 |  |
Marketable debt securities | Senior secured debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 12,513 |  |
Marketable debt securities | Promissory notes and other securities |  |  |
Marketable debt securities |  |  |
Notional amount | 41,516 |  |
Marketable debt securities | Promissory notes and other securities | Within 3 months |  |  |
Marketable debt securities |  |  |
Notional amount | 17,709 |  |
Marketable debt securities | Promissory notes and other securities | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Notional amount | 23,042 |  |
Marketable debt securities | Promissory notes and other securities | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Notional amount | 299 |  |
Marketable debt securities | Promissory notes and other securities | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | 154 |  |
Marketable debt securities | Promissory notes and other securities | More than 5 years |  |  |
Marketable debt securities |  |  |
Notional amount | € 312 |  |

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