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Note 41 Derivatives hedge accounting (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € (1,866) € 277 € (1,133)
Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (1,651) 270 (1,187)
Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (214) 7 55
Interest rate agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 73 269 (85)
Securities agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (1,500) (36) (1,072)
Commodity agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 3 1 5
Credit derivative agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (255) (89) 74
Foreign exchange agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 40 88 (75)
Other agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (12) 37 (35)
Fair value hedges ineffectivenes [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (235) 5 55
Hedging derivative fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 90 (151) (36)
Hedged item fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (325) 156 91
Cash flow hedges ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € 21 € 2 € 0