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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowances for discounts and doubtful accounts on receivables $ 29 $ 35
Common Stock, par value $ 0.01 $ 0.01
Common Stock, shares authorized 750,000,000.0 750,000,000.0
Common Stock, shares issued 192,800,000.0 192,300,000.0
Treasury Stock, shares 12,800,000.0 12,400,000.0