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Note 26 - Common Stock - Dividend Option (Details) - EUR (€)
€ / shares in Units, € in Millions
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2017
Mar. 29, 2017
Dec. 31, 2016
Oct. 31, 2016
Sep. 28, 2016
Apr. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Classes Of Share Capital Line Items                    
Number Of Shares Issued       101,271,338     86,257,317   113,677,807  
Capital (Capital base and capital management) € 3,267 € 3,267     € 3,218          
Par Value Per Share € 0.49 € 0.49   € 0.49 € 0.49   € 0.49   € 0.49  
As of Current Year [Member]                    
Classes Of Share Capital Line Items                    
Number Of Shares Issued 6,667,886,580 6,667,886,580     6,566,615,242         6,366,680,118
Capital (Capital base and capital management) € 3,267 € 3,267     € 3,218         € 3,120
Dividend Option [Member]                    
Classes Of Share Capital Line Items                    
Number Of Shares Issued     101,271,338     86,257,317   113,677,807    
Capital (Capital base and capital management)     € 50     € 42   € 56