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Note 8 - Fair Value Transfer Between Levels - Liabilities (Details) - EUR (€)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Level 1 Of Fair Value Hierarchy Member | Derivates [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Liabilities € 0 € 0 € 0
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 0 0 0
Level 1 Of Fair Value Hierarchy Member | Financial Liabilities Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Liabilities 8,000,000 1,000,000 0
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 3,000,000 0 0
Level 1 Of Fair Value Hierarchy Member | Financial Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Liabilities 0 0 0
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 0 0 0
Level 1 Of Fair Value Hierarchy Member | Total Member      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Liabilities 8,000,000 1,000,000 0
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 3,000,000 0 0
Level 2 Of Fair Value Hierarchy Member | Derivates [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 0 27,000,000 0
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Liabilities 0 0 0
Level 2 Of Fair Value Hierarchy Member | Financial Liabilities Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 268,000,000 0 138,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Liabilities 0 0 0
Level 2 Of Fair Value Hierarchy Member | Financial Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 56,000,000 27,000,000 0
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Liabilities 0 0 0
Level 2 Of Fair Value Hierarchy Member | Total Member      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Liabilities 324,000,000 54,000,000 138,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Liabilities 0 0 0
Level 3 Of Fair Value Hierarchy Member | Derivates [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Liabilities 0 0 0
Transfers Out Of Level 3 Into Level 2 Of Fair Value Hierarchy Liabilities 0 125,000,000 0
Level 3 Of Fair Value Hierarchy Member | Financial Liabilities Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Liabilities 0 0 37,000,000
Transfers Out Of Level 3 Into Level 2 Of Fair Value Hierarchy Liabilities 13,000,000 0 0
Level 3 Of Fair Value Hierarchy Member | Financial Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading [Member]      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Liabilities 0 0 0
Transfers Out Of Level 3 Into Level 2 Of Fair Value Hierarchy Liabilities 27,000,000 2,679,000,000 0
Level 3 Of Fair Value Hierarchy Member | Total Member      
Dislosure Of Level Transfer Liabilities Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Liabilities 0 0 37,000,000
Transfers Out Of Level 3 Into Level 2 Of Fair Value Hierarchy Liabilities € 40,000,000 € 2,804,000,000 € 0