v3.25.4
Note 7 Maximum credit risk exposure (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Total stage [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk € 1,104,820 € 972,990 € 904,889
Total stage [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 90,634 72,945 106,749
Total stage [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Equity investments [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 9,901 6,760 4,589
Total stage [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 30,846 27,955 28,569
Total stage [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 49,887 38,230 73,590
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 11,272 10,546 8,737
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Equity investments [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 10,539 9,782 7,963
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 192 407 484
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 541 358 290
Total stage [Member] | Financial assets designated at fair value through profit or loss [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,006 836 955
Total stage [Member] | Derivatives [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 49,141 53,229 48,747
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 58,919 59,115 62,289
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | Equity investments [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,360 1,451 1,217
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 57,046 57,639 61,047
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 513 25 26
Total stage [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 581,271 514,086 463,130
Total stage [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 73,429 59,070 49,544
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 10,881 8,261 7,176
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 24,263 22,668 17,498
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 472,697 424,087 388,912
Total stage [Member] | Total financial assets risk [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 792,242 710,757 690,606
Total stage [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 312,578 262,233 214,283
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 227,554 188,515 152,868
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantee contracts [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 24,865 22,503 18,839
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 60,159 51,215 42,577
Stage 1 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 57,020 55,315 60,255
Stage 1 [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 24 25 26
Stage 1 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 536,123 467,910 410,590
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 73,387 58,887 49,403
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 10,881 8,261 7,176
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 24,230 22,658 17,478
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 427,625 378,104 336,533
Stage 1 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 303,063 253,291 204,842
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 220,990 182,830 147,376
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantee contracts [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 23,988 21,513 17,612
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 58,084 48,948 39,854
Stage 2 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 2,309 771
Stage 2 [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 488 0 0
Stage 2 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 30,765 31,930 38,061
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 5 149 108
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34 8 18
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 30,727 31,772 37,935
Stage 2 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 8,839 8,150 8,411
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 6,385 5,524 5,326
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantee contracts [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 739 798 998
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,715 1,828 2,087
Stage 3 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 25 16 21
Stage 3 [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 3 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 14,383 14,246 14,478
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 37 34 32
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 2 2
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 14,346 14,211 14,444
Stage 3 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 676 791 1,030
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 179 160 165
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantee contracts [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 138 192 229
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk € 359 € 439 € 636