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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Current assets:    
Trade receivables, allowance for credit loss, current $ 74 $ 60
Stockholders' Equity Attributable to Parent [Abstract]    
Preferred stock par value (USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 200,000,000 200,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock par value (USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 750,000,000 750,000,000
Common stock, shares issued (in shares) 617,000,000 615,000,000
Treasury stock (in shares) 1,000,000 0