v3.26.1
Financial assets - Disclosure of gross exposure by stages of impairment (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk € 1,428,757 € 1,296,387
Other assets | Next 12 months    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,304,597 1,180,954
Other assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 88,544 83,060
Impaired assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 35,616 32,373
Financial assets at fair value through other comprehensive income    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 71,847 72,418
Financial assets at fair value through other comprehensive income | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 58,974 58,310
Financial assets at fair value through other comprehensive income | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 12,873 14,108
Financial assets at fair value through other comprehensive income | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 355 1,120
Financial assets at fair value through other comprehensive income | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 12,518 12,988
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 71,266 71,559
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 58,974 58,290
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 12,292 13,269
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 355 1,120
Financial assets at fair value through other comprehensive income | Other assets | Next 12 months | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 11,937 12,149
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 428 737
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 20
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 428 717
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Other assets | Lifetime expected credit losses | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 428 717
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 153 122
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 153 122
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at fair value through other comprehensive income | Impaired assets | Lifetime expected credit losses | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 153 122
Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,356,910 1,223,969
Financial assets at amortised cost | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 166,535 140,521
Financial assets at amortised cost | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,190,375 1,083,448
Financial assets at amortised cost | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 17,156 15,986
Financial assets at amortised cost | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 70,017 61,517
Financial assets at amortised cost | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,103,202 1,005,945
Financial assets at amortised cost | Other assets | Next 12 months    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,233,331 1,109,395
Financial assets at amortised cost | Other assets | Next 12 months | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 163,464 138,219
Financial assets at amortised cost | Other assets | Next 12 months | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,069,867 971,176
Financial assets at amortised cost | Other assets | Next 12 months | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 17,156 15,986
Financial assets at amortised cost | Other assets | Next 12 months | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 69,984 61,517
Financial assets at amortised cost | Other assets | Next 12 months | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 982,727 893,673
Financial assets at amortised cost | Other assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 88,116 82,323
Financial assets at amortised cost | Other assets | Lifetime expected credit losses | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,573 1,460
Financial assets at amortised cost | Other assets | Lifetime expected credit losses | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 86,543 80,863
Financial assets at amortised cost | Other assets | Lifetime expected credit losses | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at amortised cost | Other assets | Lifetime expected credit losses | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 33 0
Financial assets at amortised cost | Other assets | Lifetime expected credit losses | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 86,510 80,863
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 35,463 32,251
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses | Debt instruments    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 1,498 842
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses | Loans and advances    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 33,965 31,409
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses | Central Banks    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses | Credit institutions    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk 0 0
Financial assets at amortised cost | Impaired assets | Lifetime expected credit losses | Customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Maximum exposure to credit risk € 33,965 € 31,409