Restructuring (Tables)

6 Months Ended

Mar. 31, 2017

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, 2017 and 2016 as follows:

	Three Months Ended					Six Months Ended
	March 31,					March 31,
	2017		2016			2017		2016
	(In millions)
Cost of sales	$	2	$	(6	)	$	2	$	31
Selling and administrative expenses		—		1			—		8
Research and technical expenses		—		—			—		4
Total	$	2	$	(5	)	$	2	$	43

Restructuring Activities and Related Reserves

Details of all restructuring activities and the related reserves during the three months ended March 31, 2017 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Other			Total
	(In millions)
Reserve at December 31, 2016	$	2		$	2	$	—		$	4
Charges		1			—		1			2
Cash paid		(1	)		—		(1	)		(2	)
Reserve at March 31, 2017	$	2		$	2	$	—		$	4

Details of all restructuring activities during the six months ended March 31, 2017 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Other			Total
	(In millions)
Reserve at September 30, 2016	$	3		$	2	$	—		$	5
Charges		1			—		1			2
Cash paid		(2	)		—		(1	)		(3	)
Reserve at March 31, 2017	$	2		$	2	$	—		$	4