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Consolidated Statements of Financial Position (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 10 $ 14
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, shares authorized (in shares) 100,000,000  
Preferred stock, shares issued (in shares) 0  
Preferred stock, shares outstanding (in shares) 0  
Common stock, par value (in dollars per share) $ 0.001  
Common stock, shares authorized (in shares) 500,000,000  
Common stock, shares issued (in shares) 93,893,569  
Common stock, shares outstanding (in shares) 93,893,569