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Note 23 - Parenthetical Information Other Unamortizing Intangible Assets (Detail: Text Values - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Retail investment management agreements [Abstract]    
Discount rates (cost of equity) applied in the calculation   10.90%
Asset Management [Member]    
Retail investment management agreements [Abstract]    
Assets, related to the Groups U.S. retail mutual fund business, aquired in 2002, calculated at fair value less costs of disposal   € 716
Discount rates (cost of equity) applied in the calculation 10.60%  
Discount rates (cost of equity) applied in the calculation   10.90%
Terminal value growth rate applied for 2018 is up to 3.80%  
Terminal value growth rate applied for 2019 is up to   3.40%
Reassessment in fourth quarter 2022 resulted in an impairment loss € 68