Restructuring (Tables)

12 Months Ended

Sep. 30, 2021

Restructuring And Related Activities [Abstract]

Recorded Restructuring Activities

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations as follows:

	Years Ended September 30
	2021		2020		2019
	(In millions)
Cost of sales	$	7	$	6	$	9
Selling and administrative expenses		3		13		7
Research and technical expenses		1		—		—
Total	$	11	$	19	$	16

Restructuring Activities and Related Reserves

Details of all restructuring activities and the related reserves for fiscal 2019, 2020, and 2021 were as follows:

	Severance and Employee Benefits			Environmental Remediation and Decommissioning Activities			Non-Cash Asset Impairment and Accelerated Depreciation			Other			Total
	(In millions)
Reserve at September 30, 2018	$	1		$	4		$	—		$	—		$	5
Charges (gain)		11			—			2			3			16
Costs charged against assets		—			—			(2	)		—			(2	)
Cash (paid) received		(9	)		—			—			(3	)		(12	)
Reserve at September 30, 2019		3			4			—			—			7
Charges (gain)		14			—			1			4			19
Costs charged against liabilities		—			—			(1	)		—			(1	)
Cash paid		(12	)		—			—			(4	)		(16	)
Reserve at September 30, 2020		5			4			—			—			9
Charges (gain)		5			1			2			3			11
Costs charged against assets		—			—			(2	)		—			(2	)
Cash (paid) received		(5	)		(1	)		—			(3	)		(9	)
Reserve at September 30, 2021	$	5		$	4		$	—		$	—		$	9