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Note 8 Fair value of financial instruments at amortized cost by levels (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 € 67,581 € 65,355 € 44,111
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 33,213 35,196 29,391
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 91,870 90,839 67,229
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 13,033 15,066 217,279
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 243,847 255,278 289,599
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 218 165 192
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 331,205 324,005 196,119
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 € 153,016 € 144,889 € 159,082