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Note 8 - Fair Value - Fair Value Of Financial Instruments Amortised Cost - Instruments Carried At Cost - Assets (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets € 736,176,000,000 € 697,737,000,000 € 675,675,000,000
Cash cash balances at central banks and other demand deposits [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets 65,355,000,000 44,111,000,000 58,024,000,000
Cash cash balances at central banks and other demand deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets 0 0 0
Cash cash balances at central banks and other demand deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets 165,000,000 192,000,000 172,000,000
Financial Assets at amortized cost [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets 35,196,000,000 29,391,000,000 21,419,000,000
Financial Assets at amortized cost [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets 15,066,000,000 217,279,000,000 204,619,000,000
Financial Assets at amortized cost [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Contributed To Consolidated Group Assets € 324,005,000,000 € 196,119,000,000 € 193,819,000,000