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Financial liabilities at fair value through profit or loss - Non-trading rerivatives by type (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
Non-trading derivatives € 2,019 € 3,048
Other non-trading derivatives    
Disclosure of fair value measurement of liabilities [line items]    
Non-trading derivatives 1,356 1,446
-  fair value hedges    
Disclosure of fair value measurement of liabilities [line items]    
Non-trading derivatives 113 244
Cash flow hedges    
Disclosure of fair value measurement of liabilities [line items]    
Non-trading derivatives 458 1,275
-  hedges of net investments in foreign operations    
Disclosure of fair value measurement of liabilities [line items]    
Non-trading derivatives € 92 € 83