Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 29	$ 10
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)	94,378,004
Common stock, shares outstanding (in shares)	94,378,004