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Note 15 Calendar of the notional maturities of the hedging instruments (Details)
€ in Millions
Dec. 31, 2024
EUR (€)
Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 60,021
Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 58,735
Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 39,687
Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 35,348
Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 13,234
Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 2,841
Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 47
Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 115,830
Not later than three months [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 5,183
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 5,160
Not later than three months [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 4,280
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 4,280
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 12,222
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 893
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 22,579
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 10,799
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 10,650
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 16,775
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 16,577
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 861
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 179
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 28,614
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 23,509
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 22,903
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 13,346
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 11,689
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 1,364
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 38,218
Later than five years [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 20,530
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 20,023
Later than five years [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 5,286
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 2,801
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 150
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 406
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 47
Later than five years [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 26,419