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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 15 $ 15
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 600 600
Common stock, shares issued 217 217
Treasury stock, shares 84 82