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Note 35 - Derivatives - Value of Derivatives held as Fair Value Hedges (Detail) - Derivatives held as Fair Value Hedges [Member] - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Value of Derivatives held as Fair Value Hedges [line items]    
Assets € 2,246 € 2,401
Liabilities 6,386 7,668
Nominal amount 99,106 95,386
Fair value changes used for hedge effectiveness 1,917 (6,300)
Hedge ineffectiveness € 140 € (279)