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Note 2 Hedging Instruments Affected By IBOR (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
loans and advances [Member]  
Hedging Intsruments Affected By IBOR [Line Items]  
EONIA maturity after december 31 2021 € 59
LIBOR EX USD maturity after december 31 2021 1,568
LIBOR USD maturity after june 30 2023 21,256
Total gross carrying amount 22,883
Debt securities [Member]  
Hedging Intsruments Affected By IBOR [Line Items]  
EONIA maturity after december 31 2021 0
LIBOR EX USD maturity after december 31 2021 0
LIBOR USD maturity after june 30 2023 158
Total gross carrying amount 158
debt securities issued [Member]  
Hedging Intsruments Affected By IBOR [Line Items]  
EONIA maturity after december 31 2021 0
LIBOR EX USD maturity after december 31 2021 243
LIBOR USD maturity after june 30 2023 1,974
Total gross carrying amount 2,217
deposits [Member]  
Hedging Intsruments Affected By IBOR [Line Items]  
EONIA maturity after december 31 2021 371
LIBOR EX USD maturity after december 31 2021 846
LIBOR USD maturity after june 30 2023 2,015
Total gross carrying amount 3,232
Derivatives [member]  
Hedging Intsruments Affected By IBOR [Line Items]  
EONIA maturity after december 31 2021 7,079
LIBOR EX USD maturity after december 31 2021 27,343
LIBOR USD maturity after june 30 2023 474,701
Total gross carrying amount € 509,122