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EARNINGS PER SHARE - Earnings Attributable to Equity Holders of Parent used to Calculate Basic and Diluted Earnings per share (Details) - EUR (€)
€ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per share [abstract]        
Earnings attributable to equity holders of the parent used to calculate basic and diluted earnings per share € (33) € 16 € (64) € 39