Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Net Income (Loss) Attributable to Parent [Abstract]
Sales	$ 2,981	$ 2,353	$ 2,390
Cost of sales	2,001	1,490	1,580
Gross profit	980	863	810
Selling, general and administrative expenses	520	442	449
Net legacy and separation-related (income) expenses	(24)	(30)	3
Equity and other income, net	(44)	(34)	(40)
Operating income	528	485	398
Net pension and other postretirement plan (income) expenses	(126)	(59)	60
Net interest and other financing expenses	111	93	73
Income before income taxes	543	451	265
Income tax expense	123	134	57
Net income	$ 420	$ 317	$ 208
NET EARNINGS PER SHARE
Net income per share, basic (usd per share)	$ 2.30	$ 1.70	$ 1.10
Net income per share, diluted (usd per share)	$ 2.29	$ 1.69	$ 1.10
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Weighted average common shares outstanding, basic (in shares)	182	187	189
Weighted average common shares outstanding, diluted (in shares)	183	188	189
COMPREHENSIVE INCOME
Net income	$ 420	$ 317	$ 208
Other comprehensive income (loss), net of tax
Currency translation adjustments	7	7	(12)
Amortization of pension and other postretirement plan prior service credits	(9)	(9)	(9)
Unrealized gain (loss) on cash flow hedges	2	(1)	0
Other comprehensive loss	0	(3)	(21)
Comprehensive income	$ 420	$ 314	$ 187