Restructuring - Additional Information (Detail)		1 Months Ended			3 Months Ended			9 Months Ended		81 Months Ended
	Apr. 30, 2013 Employees	Nov. 30, 2015 Employees	Oct. 31, 2015 Position	Jan. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs in accrued expenses					$ 6,000,000			$ 6,000,000		$ 6,000,000	$ 13,000,000	$ 9,000,000
Restructuring Activities Other [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings								1,000,000	$ 6,000,000
Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs in accrued expenses					4,000,000			4,000,000		4,000,000	11,000,000	5,000,000
Environmental Remediation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs in accrued expenses					2,000,000			2,000,000		2,000,000	$ 2,000,000	$ 2,000,000
Maximum [Member] | Restructuring Activities Other [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings					1,000,000		$ 1,000,000
Maximum [Member] | Severance Costs [Member] | Restructuring Activities Other [Member]
Restructuring Cost And Reserve [Line Items]
Accrued severance charges					1,000,000			1,000,000		1,000,000
Operational Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position			300
Pre-tax charge to earnings					2,000,000			28,000,000
Restructuring charges after current fiscal								1,000,000
Expected cumulative net cash outlays related to plan					29,000,000			29,000,000		29,000,000
Cash payments								25,000,000
Restructuring cash payments through the reminder of fiscal 2016								2,000,000
Restructuring cash payments, thereafter								2,000,000
Operational Restructuring [Member] | Severance Costs [Member]
Restructuring Cost And Reserve [Line Items]
Accrued severance charges					3,000,000			3,000,000		3,000,000
Operational Restructuring [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges through the reminder of fiscal 2016								1,000,000
Closure of Carbon Black Facility [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings								25,000,000
Expected cumulative net cash outlays related to plan					7,000,000			7,000,000		7,000,000
Cash payments								2,000,000
Restructuring cash payments through the reminder of fiscal 2016								1,000,000
Affected employees | Employees		50
Site demolition, clearing and environmental remediation charges, and other miscellaneous costs, thereafter								4,000,000
Site demolition, clearing and environmental remediation costs								4,000,000
Severance charges								3,000,000
Restructuring future cash payments remainder of fiscal 2017								4,000,000
Closure of Carbon Black Facility [Member] | Asset Impairment and Accelerated Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings								22,000,000
Closure of Carbon Black Facility [Member] | Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings								3,000,000
Closure of Carbon Black Facility [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings					1,000,000
Site demolition, clearing and environmental remediation charges, and other miscellaneous costs of fiscal year 2016								1,000,000
Other charges								1,000,000
Closure of Carbon Black Facility [Member] | Maximum [Member] | Severance Costs [Member]
Restructuring Cost And Reserve [Line Items]
Accrued severance charges					1,000,000			1,000,000		1,000,000
Transition Services Agreement
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings				$ 24,000,000				0	5,000,000
Cash payments								21,000,000
Severance charges				16,000,000				14,000,000	1,000,000
Other charges				$ 8,000,000				7,000,000	4,000,000
Restructuring costs in accrued expenses					1,000,000			1,000,000		1,000,000
Transition Services Agreement | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Expected severance charges					1,000,000			1,000,000		1,000,000
Closure of Port Dickson [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings								19,000,000
Affected employees | Employees	90
Site demolition, clearing and environmental remediation costs								2,000,000
Severance charges								2,000,000
Other charges								1,000,000
Accelerated depreciation and asset write-offs								16,000,000
Net pre-tax gain								1,000,000
Expected cumulative net cash received to this plan					$ 3,000,000			$ 3,000,000		$ 3,000,000
Closure of Port Dickson [Member] | Land [Member]
Restructuring Cost And Reserve [Line Items]
Gain on sale of asset						$ 2,000,000
Closure of Port Dickson [Member] | Cabot [Member]
Restructuring Cost And Reserve [Line Items]
Equity share in CMSB	50.10%
Closure of Port Dickson [Member] | CMSB [Member]
Restructuring Cost And Reserve [Line Items]
Portion of the charges that are allocable to the noncontrolling interest					49.90%			49.90%		49.90%
Closure of Port Dickson [Member] | Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Expected cumulative net cash received to this plan					$ 2,000,000			$ 2,000,000		$ 2,000,000
Closure of Port Dickson [Member] | Asset Sales [Member]
Restructuring Cost And Reserve [Line Items]
Expected cumulative net cash received to this plan					7,000,000			7,000,000		7,000,000
Closure of Port Dickson [Member] | Environmental Remediation [Member]
Restructuring Cost And Reserve [Line Items]
Expected cumulative net cash received to this plan					1,000,000			1,000,000		1,000,000
Closure of Port Dickson [Member] | Facility Closure Costs [Member]
Restructuring Cost And Reserve [Line Items]
Expected cumulative net cash received to this plan					1,000,000			1,000,000		1,000,000
Closure of Port Dickson [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings					1,000,000		1,000,000	1,000,000	1,000,000
Restructuring cash payments through the reminder of fiscal 2016								1,000,000
Restructuring future cash payments remainder of fiscal 2017								1,000,000
Restructuring costs in accrued expenses					1,000,000			1,000,000		1,000,000
Previous Actions and Sites Pending Sale [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings									$ 2,000,000
Cash payments										79,000,000
Site demolition, clearing and environmental remediation costs								10,000,000		10,000,000
Severance charges								67,000,000		63,000,000
Other charges								23,000,000		25,000,000
Expected severance charges					158,000,000			158,000,000		158,000,000
Gain on sale of asset								8,000,000
Restructuring accelerated depreciation and asset impairments								66,000,000
Proceeds from sale of Assets										19,000,000
Previous Actions and Sites Pending Sale [Member] | Land [Member]
Restructuring Cost And Reserve [Line Items]
Net pre-tax gain								7,000,000
Previous Actions and Sites Pending Sale [Member] | Severance Costs [Member] | Restructuring Activities Other [Member]
Restructuring Cost And Reserve [Line Items]
Accrued severance charges					2,000,000			2,000,000		$ 2,000,000
Previous Actions and Sites Pending Sale [Member] | Environmental and Other Closure Related Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring cash payments through the reminder of fiscal 2016 and thereafter								$ 2,000,000
Previous Actions and Sites Pending Sale [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax charge to earnings					$ 1,000,000		$ 1,000,000