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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 2 $ 1
Inventory Valuation Reserves $ 23 $ 22
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 25 25
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 900 900
Common stock, shares issued 428 427
Common stock, shares, outstanding 270 282
Treasury stock, shares 158 145