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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Sales	$ 2,493	$ 2,589	$ 2,309
Equity income	0	1	0
Other income (expense)	4	3	3
Equity and other income	4	4	3
Operating income (loss)	166	102	49
Assets	7,251	8,259	8,618
Property, plant and equipment, net	1,577	1,646
Additions to property, plant and equipment	154	157	168
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	289	277	265
Property, plant and equipment, net	1,577	1,646	1,717
Additions to property, plant and equipment	154	157	168
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	2,382	2,470	2,216
Equity income	0	1	0
Other income (expense)	(1)	(5)	(2)
Operating income (loss)	272	314	233
Assets	5,705	5,955	6,050
Specialty Ingredients [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	273	252	243
Property, plant and equipment, net	1,377	1,434	1,470
Additions to property, plant and equipment	137	138	148
Intermediates and Solvents [Member]
Segment Reporting Information [Line Items]
Sales	111	119	93
Equity income	0	0	0
Other income (expense)	0	0	0
Operating income (loss)	16	17	(6)
Assets	185	192	188
Intermediates and Solvents [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	13	14	14
Property, plant and equipment, net	78	83	90
Additions to property, plant and equipment	7	5	5
Unallocated and other [Member]
Segment Reporting Information [Line Items]
Other income (expense)	5	8	5
Operating income (loss)	(122)	(229)	(178)
Assets	1,361	2,112	2,380
Unallocated and other [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3	11	8
Property, plant and equipment, net	122	129	157
Additions to property, plant and equipment	$ 10	$ 14	$ 15

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