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Note 8 - Fair Value - Fair Value Of Financial Instruments Amortised Cost - Instruments Carried At Cost - Liabilities (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Fair Value Measurement Of Liabilities Line Items |  |  |
Liabilities | € 686,156,000,000 | € 642,812,000,000 | € 622,801,000,000
Financial liabilities at amortized cost [Member] | Level 1 Of Fair Value Hierarchy Member |  |  |
Disclosure Of Fair Value Measurement Of Liabilities Line Items |  |  |
Liabilities | 90,839,000,000 | 67,229,000,000 | 58,225,000,000
Financial liabilities at amortized cost [Member] | Level 2 Of Fair Value Hierarchy Member |  |  |
Disclosure Of Fair Value Measurement Of Liabilities Line Items |  |  |
Liabilities | 255,278,000,000 | 289,599,000,000 | 269,128,000,000
Financial liabilities at amortized cost [Member] | Level 3 Of Fair Value Hierarchy Member |  |  |
Disclosure Of Fair Value Measurement Of Liabilities Line Items |  |  |
Liabilities | € 144,889,000,000 | € 159,082,000,000 | € 182,948,000,000

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