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Fair value of financial assets and liabilities - Financial assets subject to offsetting, enforceable master netting arrangements or similar agreements (Detail) - Derivatives [member] - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair value of financial assets and liabilities [Line Items]    
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements € 48 € 127
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position 48 127
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial assets 34 54
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements € 13 € 73