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Other disclosures - Schedule of undiscounted contractual maturities of financial liabilities at amortized cost by maturity (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | € 1,411,361 | € 1,465,713 | € 1,439,426
On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 699,498 | 712,248 | 712,261
Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 268,084 | 251,730 | 240,337
3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 146,183 | 167,875 | 173,287
1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 131,205 | 154,134 | 150,581
3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 71,832 | 88,099 | 86,432
More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 94,559 | 91,627 | 76,528
Deposits |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 1,068,312 | 1,102,126 | 1,099,444
Deposits | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 687,708 | 699,007 | 698,595
Deposits | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 221,487 | 207,554 | 204,001
Deposits | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 95,553 | 117,431 | 109,311
Deposits | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 36,937 | 43,090 | 51,191
Deposits | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 9,204 | 19,248 | 20,761
Deposits | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 17,423 | 15,796 | 15,585
Central banks |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 18,454 | 24,904 | 48,817
Central banks | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 857 | 17 | 168
Central banks | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 8,497 | 9,082 | 20,334
Central banks | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 4,581 | 11,026 | 6,853
Central banks | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 2,892 | 4,772 | 16,846
Central banks | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 0 | 0 | 4,581
Central banks | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 1,627 | 7 | 35
Credit institutions |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 74,642 | 89,680 | 80,548
Credit institutions | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 6,298 | 13,634 | 6,884
Credit institutions | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 34,993 | 27,170 | 25,642
Credit institutions | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 11,677 | 19,258 | 21,334
Credit institutions | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 12,197 | 15,674 | 13,079
Credit institutions | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 1,841 | 6,482 | 5,924
Credit institutions | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 7,636 | 7,462 | 7,685
Customers |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 975,216 | 987,542 | 970,079
Customers | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 680,553 | 685,356 | 691,543
Customers | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 177,997 | 171,302 | 158,025
Customers | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 79,295 | 87,147 | 81,124
Customers | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 21,848 | 22,644 | 21,266
Customers | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 7,363 | 12,766 | 10,256
Customers | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 8,160 | 8,327 | 7,865
Marketable debt securities |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 306,952 | 323,671 | 299,795
Marketable debt securities | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 0 | 0 | 0
Marketable debt securities | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 37,742 | 36,315 | 28,258
Marketable debt securities | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 47,782 | 48,973 | 62,935
Marketable debt securities | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 93,250 | 102,306 | 91,492
Marketable debt securities | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 62,071 | 61,260 | 56,944
Marketable debt securities | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 66,107 | 74,817 | 60,166
Other financial liabilities |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 36,097 | 39,916 | 40,187
Other financial liabilities | On demand |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 11,790 | 13,241 | 13,666
Other financial liabilities | Within 3 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 8,855 | 7,861 | 8,078
Other financial liabilities | 3 to 12 months |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 2,848 | 1,471 | 1,041
Other financial liabilities | 1 to 3 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 1,018 | 8,738 | 7,898
Other financial liabilities | 3 to 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | 557 | 7,591 | 8,727
Other financial liabilities | More than 5 years |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Undiscounted financial liabilities at amortised cost | € 11,029 | € 1,014 | € 777

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