Restructuring Costs (Tables)

6 Months Ended

Mar. 31, 2021

Restructuring and Related Activities [Abstract]

Schedule of Changes in Restructuring Reserves

The changes in restructuring reserves for the six months ended ended March 31, 2021 and 2020 are as follows (in millions):

	Employee Termination Benefits		Plant  Shutdown  & Other		Total
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
Balance at September 30, 2019	$	8	$	—	$	8
Activity during the period:
Charges	15		—		15
Cash payments	(15)		—		(15)
Other	(1)		—		(1)
Total restructuring reserves at March 31, 2020	7		—		7
Less: non-current restructuring reserves	—		—		—
Restructuring reserves – current, at March 31, 2020	$	7	$	—	$	7