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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 52 $ 39
Preferred stock,par value $ 0.01 $ 0.01
Preferred stock,shares authorized 10,000,000 10,000,000
Preferred stock,shares issued 0 0
Preferred stock,shares outstanding 0 0
Common stock,par value $ 0.01 $ 0.01
Common stock,shares authorized 250,000,000 250,000,000
Common stock,shares issued 137,000,000 137,000,000
Treasury stock,shares 63,000,000 61,000,000