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Marketable debt securities - Disclosure of maturity analysis of debt instruments, book value (Details) - Marketable debt securities - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Marketable debt securities |  |  |
Financial liabilities | € 324,390 | € 325,521 | € 308,579
Debt securities issued |  |  |
Marketable debt securities |  |  |
Financial liabilities | 324,390 |  |
Debt securities issued | Within 3 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 39,785 |  |
Debt securities issued | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 49,809 |  |
Debt securities issued | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 97,217 |  |
Debt securities issued | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 65,018 |  |
Debt securities issued | More than 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 72,561 |  |
Subordinated debt |  |  |
Marketable debt securities |  |  |
Financial liabilities | 28,859 | 35,461 | 30,529
Subordinated debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 0 |  |
Subordinated debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 798 |  |
Subordinated debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 1,760 |  |
Subordinated debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 2,277 |  |
Subordinated debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 24,024 |  |
Senior unsecured debt |  |  |
Marketable debt securities |  |  |
Financial liabilities | 145,696 |  |
Senior unsecured debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 10,509 |  |
Senior unsecured debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 13,643 |  |
Senior unsecured debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 51,461 |  |
Senior unsecured debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 34,465 |  |
Senior unsecured debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 35,618 |  |
Senior secured debt |  |  |
Marketable debt securities |  |  |
Financial liabilities | 108,197 |  |
Senior secured debt | Within 3 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 11,529 |  |
Senior secured debt | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 12,308 |  |
Senior secured debt | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 43,661 |  |
Senior secured debt | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 28,106 |  |
Senior secured debt | More than 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 12,593 |  |
Promissory notes and other securities |  |  |
Marketable debt securities |  |  |
Financial liabilities | 41,638 | € 37,295 | € 46,170
Promissory notes and other securities | Within 3 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 17,747 |  |
Promissory notes and other securities | 3 to 12 months |  |  |
Marketable debt securities |  |  |
Financial liabilities | 23,060 |  |
Promissory notes and other securities | 1 to 3 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 335 |  |
Promissory notes and other securities | 3 to 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | 170 |  |
Promissory notes and other securities | More than 5 years |  |  |
Marketable debt securities |  |  |
Financial liabilities | € 326 |  |

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