Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2018	[2]	Jun. 30, 2018
Goodwill And Intangible Assets [Line Items]
Beginning balance				$ 154
Goodwill acquired	[1]			33
Impairment charge		$ (92)		(92)
Foreign currency impact				(3)
Ending balance				92
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance				53
Foreign currency impact				(2)
Ending balance				51
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance				9
Goodwill acquired	[1]			33
Foreign currency impact				(1)
Ending balance				41
Purification Solutions [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance				92
Impairment charge		$ (92)		$ (92)

[1] Consists of goodwill acquired in the acquisition of Tech Blend as described in Note C.

[2] Refer to Note E for details on the Purification Solutions goodwill impairment test and the resulting impairment charge recorded in the second fiscal quarter of 2018. Based on the Company’s most recent annual goodwill impairment test performed as of May 31, 2018, the fair values of the Reinforcement Materials, Fumed Metal Oxides, and Specialty Compounds reporting units were substantially in excess of their carrying values.