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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 1,000,000,000.0 1,000,000,000.0
Common stock, shares issued (in shares) 410,000,000 450,000,000
Treasury stock, shares 700,000 1,000,000.0