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Consolidated Balance Sheets (Parenthetical) - € / shares
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Preferred stock, shares authorized 540,000,000 540,000,000
Preferred stock, shares issued 0 0
Common stock, nominal value € 1.04 € 1.04
Common stock, shares authorized 1,200,000,000 1,200,000,000
Common stock, shares issued 911,239,420 911,186,920
Common stock, shares outstanding 905,415,002 891,434,489