Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income		$ 304	$ 273	$ 196
Adjustments to reconcile to cash flows from operations
Depreciation and amortization		42	38	38
Debt issuance cost amortization		3	4	0
Deferred income taxes		117	13	(9)
Equity income from affiliates		(12)	(12)	(12)
Distributions from equity affiliates		8	16	18
Net loss on acquisition and divestiture		0	1	26
Impairment of equity investment		0	0	14
Pension contributions		(412)	(2)	0
(Gain) loss on Valvoline pension and other postretirement plan remeasurements		(68)	(42)	2
Stock-based compensation expense		9	0	0
Change in assets and liabilities
Accounts receivable	[1]	(22)	(17)	53
Inventories	[1]	(35)	(4)	(6)
Payables and accrued liabilities	[1]	0	5	2
Other assets and liabilities	[1]	(64)	38	8
Total cash (used in) provided by operating activities		(130)	311	330
Cash flows from investing activities
Additions to property, plant and equipment		(68)	(66)	(45)
Proceeds from disposal of property, plant and equipment		1	1	1
Acquisitions, net of cash required		(68)	(83)	(5)
Proceeds from sale of operations		0	0	23
Total cash used in investing activities		(135)	(148)	(26)
Cash flows from financing activities
Net transfers from (to) Ashland		5	(1,504)	(304)
Cash contributions from Ashland		0	60	0
Proceeds from initial public offering, net of offering costs of $40		0	719	0
Proceeds from borrowings, net of issuance costs of $5 in 2017 and $15 in 2016		470	1,372	0
Repayments on borrowings		(90)	(637)	0
Repurchase of common stock		(50)	0	0
Cash dividends paid		(40)	0	0
Total cash provided by (used in) financing activities		295	10	(304)
Effect of currency exchange rate changes on cash and cash equivalents		(1)	(1)	0
Increase in cash and cash equivalents		29	172	0
Cash and cash equivalents - beginning of year		172	0	0
Cash and cash equivalents - end of year		201	172	0
Supplemental disclosures
Interest paid		35	0	0
Income taxes paid		$ 26	$ 17	$ 0

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