Supplemental Financial Information - Revenue Recognition and Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Inventory [Line Items]
Sales	$ 792	$ 516	$ 2,146	$ 1,701
Transferred over Time [Member]
Inventory [Line Items]
Sales	13	8	36	28
Transferred at Point in Time [Member]
Inventory [Line Items]
Sales	$ 779	$ 508	$ 2,110	$ 1,673