Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income		$ 166	$ 304	$ 273
Adjustments to reconcile to cash flows from operations
Depreciation and amortization		54	42	38
Debt issuance cost and discount amortization		3	3	4
Deferred income taxes		145	117	13
Equity income from unconsolidated affiliates, net of distributions		(4)	(4)	4
Pension contributions		(16)	(412)	(2)
Loss (gain) on pension and other postretirement plan remeasurements		38	(68)	(42)
Stock-based compensation expense		12	9	0
Other, net		1	0	1
Change in assets and liabilities
Accounts receivable	[1]	(38)	(22)	(17)
Inventories	[1]	(4)	(35)	(4)
Payables and accrued liabilities	[1]	(2)	0	5
Other assets and liabilities	[1]	(35)	(64)	38
Total cash provided by (used in) operating activities		320	(130)	311
Cash flows from investing activities
Additions to property, plant and equipment		(93)	(68)	(66)
Acquisitions, net of cash acquired		(125)	(68)	(83)
Other investing activities, net		5	1	1
Total cash used in investing activities		(213)	(135)	(148)
Cash flows from financing activities
Net transfers from (to) Ashland		0	5	(1,504)
Cash contributions from Ashland		0	0	60
Proceeds from initial public offering, net of offering costs of $40		0	0	719
Proceeds from borrowings, net of issuance costs		304	470	1,372
Repayments on borrowings		(108)	(90)	(637)
Repurchases of common stock		(325)	(50)	0
Purchase of additional ownership in subsidiary		(15)	0	0
Cash dividends paid		(58)	(40)	0
Other financing activities		(7)	0	0
Total cash (used in) provided by financing activities		(209)	295	10
Effect of currency exchange rate changes on cash and cash equivalents		(3)	(1)	(1)
(Decrease) increase in cash and cash equivalents		(105)	29	172
Cash and cash equivalents - beginning of year		201	172	0
Cash and cash equivalents - end of year		96	201	172
Supplemental disclosures
Interest paid		53	35	0
Income taxes paid		$ 26	$ 26	$ 17

[1] Excludes changes resulting from operations acquired or sold.