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Segments - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Total income € 18,121 € 30,418 € 20,093
Impairments 5 192 3
Hyperinflationary accounting, net profit (loss) 234    
Net result IFRS-EU | Segments banking activities      
Disclosure of operating segments [line items]      
Total income 22,575 18,561 18,490
–  Operating expenses 11,564 11,199 11,192
Net result IFRS-EU | Segments banking activities | Corporate Line      
Disclosure of operating segments [line items]      
Total income 450 84 387
Hyperinflationary accounting, income (179) (279)  
Total income excl hyperinflationary impacts 266    
–  Operating expenses € 542 535 € 580
Increase in operating expenses 1300.00%    
Hyperinflationary accounting, net profit (loss) € 48 30  
Provision for hyperinflationary impact   51  
Goodwill impairment   32  
TMBThanachart Bank Public Company Limited & Bank Of Beijing      
Disclosure of operating segments [line items]      
Share of profit (loss) of associates accounted for using equity method € 185    
TMBThanachart Bank Public Company Limited | Net result IFRS-EU | Segments banking activities | Corporate Line      
Disclosure of operating segments [line items]      
Impairments   € (165)