Employee Benefit Plans - Schedule of Components of Pension and Other Postretirement Benefit Costs for Continuing Operation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain)		$ (1)		$ (1)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	1	$ 2	2
Interest cost	3	1	6	3
Expected return on plan assets	(2)	(2)	(4)	(4)
Actuarial (gain)	0	(1)	0	(1)
Total net periodic benefit costs	2	(1)	4	0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	1	1
Expected return on plan assets	0	0	0	0
Actuarial (gain)	0	0	0	0
Total net periodic benefit costs	$ 1	$ 1	$ 1	$ 1