Restructuring Costs (Tables)

6 Months Ended

Mar. 31, 2022

Restructuring and Related Activities [Abstract]

Schedule of Changes in Restructuring Reserves

The changes in restructuring reserves for the six months ended March 31, 2022 and 2021 are as follows (in millions):

	Employee Termination Benefits		Plant  Shutdown  & Other		Total
Balance at September 30, 2021	$	5	$	1	$	6
Activity during the period:
Charges	1		3		4
Cash payments	(4)		(4)		(8)
Other	1		—		1
Total restructuring reserves at March 31, 2022	3		—		3
Less: non-current restructuring reserves	(1)		—		(1)
Restructuring reserves – current, at March 31, 2022	$	2	$	—	$	2
Balance at September 30, 2020	$	10	$	—	$	10
Activity during the period:
Charges	6		2		8
Cash payments	(8)		—		(8)
Other	(1)		(2)		(3)
Total restructuring reserves at March 31, 2021	7		—		7
Less: non-current restructuring reserves	—		—		—
Restructuring reserves – current, at March 31, 2021	$	7	$	—	$	7