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Note 4 - Shareholder Remuneration System - Dividens (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Apr. 30, 2018
Mar. 31, 2018
Oct. 31, 2017
Sep. 30, 2017
Feb. 28, 2017
Dec. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Share holder Remuneration System Abstract                    
Dividends Paid per share   € 0.1   € 0.15   € 0.09   € 0.08   € 0.08
Net Dividends Paid per share   € 0.081   € 0.1215   € 0.0729   € 0.0648   € 0.0648
Dividend distribution € 663   € 996   € 599   € 525   € 517