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Note 41 Derivatives hedge accounting (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € 1,361 € (1,866) € 277
Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 1,406 (1,651) 270
Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (45) (214) 7
Interest rate agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 522 73 269
Securities agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 1,653 (1,500) (36)
Commodity agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 4 3 1
Credit derivative agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 16 (255) (89)
Foreign exchange agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (658) 40 88
Other agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (131) (12) 37
Fair value hedges ineffectivenes [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (51) (235) 5
Hedging derivative fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (229) 90 (151)
Hedged item fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 178 (325) 156
Cash flow hedges ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € 6 € 21 € 2