Restructuring (Tables)

12 Months Ended

Sep. 30, 2015

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
	2015		2014		2013
	(Dollars in millions)
Cost of sales	$	10	$	12	$	28
Selling and administrative expenses		11		17		7
Total	$	21	$	29	$	35

Restructuring Activities and Related Reserves

Details of these restructuring activities and the related reserves for fiscal 2015 and 2014 were as follows:

	Severance and Employee Benefits			Environmental Remediation			Asset Impairment and Accelerated Depreciation			Asset Sales			Other			Total
	(Dollars in millions)
Reserve at September 30, 2013	$	7		$	2		$	—		$	—		$	1		$	10
Charges		18			1			4			1			5			29
Costs charged against assets and other		—			—			(4	)		—			—			(4	)
Cash paid		(8	)		(1	)		—			(1	)		(5	)		(15	)
Foreign currency translation adjustment		(1	)		—			—			—			—			(1	)
Reserve at September 30, 2014	$	16		$	2		$	—		$	—		$	1		$	19
Charges		9			—			5			—			7			21
Costs charged against assets and other		—			—			(5	)		—			—			(5	)
Cash paid		(18	)		—			—			—			(6	)		(24	)
Foreign currency translation adjustment		(2	)		—			—			—			—			(2	)
Reserve at September 30, 2015	$	5		$	2		$	—		$	—		$	2		$	9