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Derivatives - Summary of Gains Losses On Cash Flow Hedge Ineffectiveness (Detail) - Cash flow hedges [member] - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Gains Losses On Cash Flow Hedge Ineffectiveness [Line Items]      
Hedge ineffectiveness on cash flow hedges € 2 € 0 € 3
Gains/(losses) reclassified from equity into the income statement 27 42 20
Expected deferred gain/(loss) to be reclassified from equity into net result during the next 12 months € 84 € 88 € 114