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Note 15 Calendar of the notional maturities of the hedging instruments (Details)
€ in Millions
Dec. 31, 2021
EUR (€)
Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 53,409
Of which interest rate fair value hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 52,021
Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 44,332
Of which interest rate cash flow hedges [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 41,882
Hedges of net investment in foreign operations [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 4,857
Portfolio fair value hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 3,187
Portfolio cash flow hedges of interest rate risk [Member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 1,583
Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 107,368
Not later than three months [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 2,820
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 2,807
Not later than three months [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 195
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 0
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 2,241
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 175
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 171
Not later than three months [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 5,602
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 8,467
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 8,360
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 3,346
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 2,713
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 2,617
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 647
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 428
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 15,505
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 28,506
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 27,239
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 36,410
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 34,787
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 1,258
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 851
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 67,024
Later than five years [member] | Fair value hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 13,615
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 13,615
Later than five years [member] | Cash flow hedges [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments 4,381
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 4,381
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 1,108
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 132
Later than five years [member] | Derivatives [member]  
Notional maturities of the hedging instruments [Line Items]  
Notional maturities of the hedging instruments € 19,236