v3.26.1
Risk management - Schedule of maturity analysis of assets and guarantees received and committed (Details) - Liquidity risk - With mortgage collateral
€ in Millions
Dec. 31, 2025
EUR (€)
On-balance-sheet assets  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets € 306,400
On-balance-sheet assets | Unmatured  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 24,200
On-balance-sheet assets | 1 month  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 50,700
On-balance-sheet assets | 1 to 3 months  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 14,100
On-balance-sheet assets | 3 to 12 months  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 38,400
On-balance-sheet assets | 1 to 2 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 38,800
On-balance-sheet assets | 2 to 3 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 29,500
On-balance-sheet assets | 3 to 5 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 37,700
On-balance-sheet assets | 5 to 10 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 36,300
On-balance-sheet assets | More than 10 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Committed assets 36,600
Off-balance-sheet assets  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 185,160
Off-balance-sheet assets | Unmatured  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 2,200
Off-balance-sheet assets | 1 month  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 85,200
Off-balance-sheet assets | 1 to 3 months  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 28,200
Off-balance-sheet assets | 3 to 12 months  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 61,800
Off-balance-sheet assets | 1 to 2 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 4,000
Off-balance-sheet assets | 2 to 3 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 800
Off-balance-sheet assets | 3 to 5 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 1,900
Off-balance-sheet assets | 5 to 10 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed 1,100
Off-balance-sheet assets | More than 10 years  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Guarantees received committed € 0