Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Income (Loss) Attributable to Parent [Abstract]
Sales	$ 792	$ 516	$ 2,146	$ 1,701
Cost of sales	533	329	1,412	1,096
Gross profit	259	187	734	605
Selling, general and administrative expenses	136	106	382	319
Net legacy and separation-related expenses	1	1	2	0
Equity and other income, net	(9)	(8)	(36)	(23)
Operating income	131	88	386	309
Net pension and other postretirement plan income	(14)	(9)	(41)	(27)
Net interest and other financing expenses	17	19	92	73
Income before income taxes	128	78	335	263
Income tax expense	31	19	83	68
Net Income (Loss) Attributable to Parent, Total	$ 97	$ 59	$ 252	$ 195
NET EARNINGS PER SHARE
Basic (usd per share)	$ 0.53	$ 0.32	$ 1.38	$ 1.04
Diluted (usd per share)	$ 0.53	$ 0.32	$ 1.37	$ 1.04
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Basic (shares)	182	186	183	187
Diluted (shares)	183	186	184	188
COMPREHENSIVE INCOME
Net income	$ 97	$ 59	$ 252	$ 195
Other comprehensive income (loss), net of tax
Currency translation adjustments	4	10	15	(3)
Amortization of pension and other postretirement plan prior service credit	(2)	(3)	(6)	(7)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	0	0	1	0
Other comprehensive income (loss)	2	7	10	(10)
Comprehensive income	$ 99	$ 66	$ 262	$ 185