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Note 8 Fair value of financial instruments at amortized cost by levels (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Level 1 Of Fair Value Hierarchy [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets € 79,463 € 67,581 € 65,355
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets 34,555 33,213 35,196
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Liabilities 77,112 91,870 90,839
Level 2 Of Fair Value Hierarchy [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets 13,393 13,033 15,066
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Liabilities 266,194 243,847 255,278
Level 3 Of Fair Value Hierarchy [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets 293 218 165
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Assets 371,112 331,205 324,005
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at amortised cost, category [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Liabilities € 181,746 € 153,016 € 144,889