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Note 41 Derivatives hedge accounting (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € 181 € (812) € 1,361
Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 176 (795) 1,406
Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 5 (17) (45)
Interest rate agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (21) 427 522
Securities agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 236 (402) 1,653
Credit derivative agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (123) (56) 16
Foreign exchange agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (15) (431) (658)
Other agreements hedge accounting [Member] | Trading derivatives hedge accounting [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 99 (332) (127)
Fair value hedges ineffectivenes [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 8 (10) (51)
Hedging derivative fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting (512) (114) (229)
Hedged item fair value ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting 520 103 178
Cash flow hedges ineffectiveness [Member] | Hedging derivatives ineffectiveness [Member]      
Derivatives hedge accounting [Line Items]      
Derivatives- hedge accounting € (3) € (7) € 6