v3.25.4
Note 15 Calendar of the notional maturities of the hedging instruments (Details)
€ in Millions
Dec. 31, 2025
EUR (€)
Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 66,516
Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 65,099
Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 38,281
Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 33,784
Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 16,750
Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 5,988
Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 127,535
Not later than three months [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 6,701
Not later than three months [member] | Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 6,490
Not later than three months [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 2,883
Not later than three months [member] | Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 2,883
Not later than three months [member] | Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 14,535
Not later than three months [member] | Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 250
Not later than three months [member] | Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Not later than three months [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 24,369
Later than three months and not later than one year [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 15,373
Later than three months and not later than one year [member] | Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 14,865
Later than three months and not later than one year [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 9,300
Later than three months and not later than one year [member] | Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 9,300
Later than three months and not later than one year [member] | Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 2,215
Later than three months and not later than one year [member] | Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 582
Later than three months and not later than one year [member] | Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Later than three months and not later than one year [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 27,470
Later than one year and not later than five years [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 25,342
Later than one year and not later than five years [member] | Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 24,980
Later than one year and not later than five years [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 22,197
Later than one year and not later than five years [member] | Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 20,190
Later than one year and not later than five years [member] | Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Later than one year and not later than five years [member] | Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 3,255
Later than one year and not later than five years [member] | Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Later than one year and not later than five years [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 50,794
Later than five years [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 19,101
Later than five years [member] | Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 18,763
Later than five years [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 3,901
Later than five years [member] | Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 1,411
Later than five years [member] | Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Later than five years [member] | Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 1,901
Later than five years [member] | Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 0
Later than five years [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 24,903