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Note 8 - Fair Value - Fair Value Of Financial Instruments Amortised Cost - Instruments Carried At Cost - Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 623,814 € 636,736 € 676,428
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 58,225    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 269,128    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 182,948