Purification Solutions Goodwill and Long-Lived Assets Impairment Charges - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018		Jun. 30, 2018
Goodwill And Intangible Assets [Line Items]
Purification Solutions goodwill impairment charge			$ 92	[1]	$ 92
Long-lived assets impairment charge					162
Assets impairment charges income tax benefit		$ 30
Reducing of impairment charges and restructuring costs	$ 2
Purification Solutions [Member]
Goodwill And Intangible Assets [Line Items]
Purification Solutions goodwill impairment charge			92	[1]	92
Lower of cost or market reserve inventory			13
Long-lived assets impairment charge			162		$ 162
Impairment charges of definite lived Intangible assets			64
Purification Solutions [Member] | Property, Plant and Equipment [Member]
Goodwill And Intangible Assets [Line Items]
Long-lived assets impairment charge			$ 98

[1] 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.