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Note 6 Changes in loss allowances of loans and advances at amortized cost (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Changes In Loss Allowances Of Loans And Advances At Amortized Cost [Line Items]    
Loss allowances of loans and advances at amortised cost at the beginning of the period € (11,291) € (11,142)
Increase in loss allowances charged to income (4,681) (8,288)
Decrease in loss allowances charged to income 2,795 4,891
Transfer To Written Off Loans Exchange Differences And Other 1,935 3,248
Loss allowances of loans and advances at amortised cost at the end of the period (11,241) (11,291)
Stage 1 [Member]    
Changes In Loss Allowances Of Loans And Advances At Amortized Cost [Line Items]    
Increase in loss allowances charged to income (833) (1,556)
Decrease in loss allowances charged to income 730 1,342
Stage 2 [Member]    
Changes In Loss Allowances Of Loans And Advances At Amortized Cost [Line Items]    
Increase in loss allowances charged to income (1,080) (1,443)
Decrease in loss allowances charged to income 747 1,213
Stage 3 [Member]    
Changes In Loss Allowances Of Loans And Advances At Amortized Cost [Line Items]    
Increase in loss allowances charged to income (2,768) (5,289)
Decrease in loss allowances charged to income € 1,319 € 2,336