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Consolidated balance sheets (Parenthetical) - € / shares
Sep. 30, 2019
Dec. 31, 2018
Consolidated balance sheets    
Par value (in dollars per share) € 0  
Nominal value (in dollars per share) € 1.00  
Shares authorized 374,165,226 384,822,972
Shares issued 304,356,545 307,878,652
Shares outstanding 300,359,593 306,878,701