Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 286	$ (221)	$ 186
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	160	158	148
Impairment of investment in equity affiliate			11
Deferred tax provision (benefit)	9	130	(27)
Employee benefit plan settlement	5	4	7
Equity in net income of affiliated companies	(3)	(3)	(1)
Non-cash compensation	21	9	11
Other non-cash (income) expense	21	8	(3)
Cash dividends received from equity affiliates	2	1	2
Changes in assets and liabilities:
Accounts and notes receivable	(215)	126	73
Inventories	(174)	114	27
Prepaid expenses and other current assets	(37)	(7)	18
Accounts payable and accrued liabilities	167	(55)	(75)
Income taxes payable	14	(5)	(6)
Other liabilities	1	(11)	(37)
Cash provided by operating activities	257	377	363
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(195)	(200)	(224)
Proceeds from sale of business			135
Cash paid for acquisition of business, net of cash acquired of $—, $1 and $—		(92)	(3)
Other	9	4	(2)
Cash used in investing activities	(186)	(288)	(94)
Cash Flows from Financing Activities:
Borrowings under financing arrangements			29
Repayments under financing arrangements			(29)
Proceeds from (repayments of) issuance of commercial paper, net	58	(19)	(216)
Proceeds from long-term debt, net of issuance costs	200	444	352
Repayments of long-term debt	(222)	(410)	(75)
Repayments of redeemable preferred stock			(25)
Purchases of common stock	(3)	(44)	(173)
Proceeds from sales of common stock	6	3	4
Cash dividends paid to noncontrolling interests	(19)	(26)	(23)
Cash dividends paid to common stockholders	(80)	(80)	(80)
Cash used in financing activities	(60)	(132)	(236)
Effects of exchange rate changes on cash	8	25	(39)
Increase (decrease) in cash, cash equivalents and restricted cash	19	(18)	(6)
Cash, cash equivalents and restricted cash at beginning of year	151	169	175
Cash, cash equivalents and restricted cash at end of year	170	151	169
The following table presents the Company’s cash, cash equivalents and restricted cash by category within the Consolidated Balance Sheets:
Cash and cash equivalents	168	$ 151	$ 169
Restricted cash classified within Prepaid expenses and other current assets	$ 2
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid expenses and other current assets	Prepaid expenses and other current assets	Prepaid expenses and other current assets
Cash, cash equivalents and restricted cash	$ 170	$ 151	$ 169
Non-cash investing activities and supplemental cash flow information:
Additions to property, plant and equipment included in Accounts payable and accrued liabilities	41	29	23
Income taxes paid	93	71	99
Interest paid	$ 41	48	47
Marshall Mine [Member]
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Loss on sale and asset impairment charge		$ 129
Specialty Fluids [Member]
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Loss on sale and asset impairment charge			$ 29