Restructuring (Tables)

6 Months Ended

Mar. 31, 2021

Restructuring And Related Activities [Abstract]

Recorded Restructuring Activities

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations in the three and six months ended March 31, 2021 and 2020 as follows:

	Three Months Ended March 31				Six Months Ended March 31
	2021		2020		2021		2020
	(In millions)
Cost of sales	$	—	$	4	$	3	$	5
Selling and administrative expenses		—		1		—		8
Research and technical expenses		1		—		1		—
Total	$	1	$	5	$	4	$	13

Restructuring Activities and Related Reserves

Details of all restructuring activities and the related reserves during the three and six months ended March 31, 2021 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Non-cash Asset Impairment			Other			Total
	(In millions)
Reserve at September 30, 2020	$	5		$	4	$	—		$	—		$	9
Charges (gain)		—			—		2			1			3
Cost charged against assets		—			—		(2	)		—			(2	)
Cash paid		(2	)		—		—			(1	)		(3	)
Reserve at December 31, 2020		3			4		—			—			7
Charges (gain)		1			—		—			—			1
Costs charged against assets / (liabilities)		—			—		—			—			—
Cash paid		(2	)		—		—			—			(2	)
Reserve at March 31, 2021		2			4		—			—			6