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Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 568	$ 694	$ 1,171	$ 1,506
Income (loss) from continuing operations before taxes	62	39	54	90
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	550	674	1,118	1,455
Income (loss) from continuing operations before taxes	88	69	159	166
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	18	20	53	51
Income (loss) from continuing operations before taxes	(26)	(30)	(105)	(76)
Reinforcement Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	261	358	549	818
Income (loss) from continuing operations before taxes	34	27	60	80
Performance Chemicals [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	216	237	423	466
Income (loss) from continuing operations before taxes	58	42	108	81
Purification Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	67	71	133	147
Income (loss) from continuing operations before taxes	(2)	1	(7)
Specialty Fluids [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	6	8	13	24
Income (loss) from continuing operations before taxes	$ (2)	$ (1)	$ (2)	$ 5

X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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