Employee Benefit Plans - Schedule of Components of Pension and Other Postretirement Benefit Costs for Continuing Operation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain)			$ (1)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	3	$ 4
Interest cost	2	2	5	4
Expected return on plan assets	(1)	(2)	(5)	(5)
Actuarial (gain)	0	0	(1)	0
Total net periodic benefit costs	2	1	2	3
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Actuarial (gain)	0	0	0	0
Total net periodic benefit costs	$ 0	$ 0	$ 1	$ 1