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Debt securities - Schedule of debt instruments by origin of issuer (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Debt Instruments |  |  |
Financial assets | € 300,026 | € 283,497 | € 243,203
Financial assets (as a percent) |  | 100.00% | 100.00%
Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 300,026 | € 283,497 | € 243,203
Financial assets (as a percent) | 100.00% | 100.00% | 100.00%
Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 63,816 | € 61,831 | € 57,150
Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 236,210 | 221,666 | 186,053
Spain | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 66,270 | € 58,820 | € 42,846
Financial assets (as a percent) | 22.09% | 20.75% | 17.62%
Spain | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 2,528 | € 1,901 | € 2,525
Spain | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 63,742 | 56,919 | 40,321
United Kingdom | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 11,563 | € 12,980 | € 7,564
Financial assets (as a percent) | 3.85% | 4.58% | 3.11%
United Kingdom | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 2,336 | € 3,077 | € 2,816
United Kingdom | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 9,227 | 9,903 | 4,748
Portugal | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 8,839 | € 8,362 | € 7,641
Financial assets (as a percent) | 2.95% | 2.95% | 3.14%
Portugal | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 3,212 | € 3,224 | € 2,826
Portugal | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 5,627 | 5,138 | 4,815
Italy | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 27,036 | € 26,026 | € 15,913
Financial assets (as a percent) | 9.01% | 9.18% | 6.54%
Italy | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 2,821 | € 3,072 | € 2,968
Italy | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 24,215 | 22,954 | 12,945
Ireland | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 4,281 | € 4,571 | € 5,643
Financial assets (as a percent) | 1.43% | 1.61% | 2.32%
Ireland | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 4,239 | € 4,557 | € 5,632
Ireland | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 42 | 14 | 11
Poland | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 1,487 | € 17,696 | € 15,419
Financial assets (as a percent) | 0.50% | 6.24% | 6.34%
Poland | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 22 | € 2,472 | € 2,937
Poland | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 1,465 | 15,224 | 12,482
Other EU countries | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 38,576 | € 24,295 | € 25,292
Financial assets (as a percent) | 12.86% | 8.57% | 10.40%
Other EU countries | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 12,682 | € 11,593 | € 9,797
Other EU countries | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 25,894 | 12,702 | 15,495
US | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 44,140 | € 40,286 | € 31,951
Financial assets (as a percent) | 14.71% | 14.21% | 13.14%
US | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 14,941 | € 12,475 | € 8,959
US | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 29,199 | 27,811 | 22,992
Brazil | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 47,426 | € 45,383 | € 45,893
Financial assets (as a percent) | 15.81% | 16.01% | 18.87%
Brazil | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 13,518 | € 12,738 | € 13,551
Brazil | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 33,908 | 32,645 | 32,342
Mexico | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 28,114 | € 23,012 | € 22,707
Financial assets (as a percent) | 9.37% | 8.12% | 9.34%
Mexico | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 3,001 | € 2,190 | € 1,969
Mexico | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 25,113 | 20,822 | 20,738
Chile | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 8,704 | € 7,078 | € 12,044
Financial assets (as a percent) | 2.90% | 2.50% | 4.95%
Chile | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 137 | € 96 | € 49
Chile | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 8,567 | 6,982 | 11,995
Other American countries | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 9,208 | € 7,838 | € 4,861
Financial assets (as a percent) | 3.07% | 2.76% | 2.00%
Other American countries | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 3,254 | € 3,336 | € 2,315
Other American countries | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | 5,954 | 4,502 | 2,546
Rest of the world | Debt securities |  |  |
Debt Instruments |  |  |
Financial assets | € 4,382 | € 7,150 | € 5,429
Financial assets (as a percent) | 1.45% | 2.52% | 2.23%
Rest of the world | Private fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 1,125 | € 1,100 | € 806
Rest of the world | Public fixed income |  |  |
Debt Instruments |  |  |
Financial assets | € 3,257 | € 6,050 | € 4,623

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