Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net Income (Loss) Attributable to Parent [Abstract]
Sales	$ 607	$ 557
Cost of sales	396	374
Gross profit	211	183
Selling, general and administrative expenses	117	105
Legacy and separation related expenses,income, net	(1)	0
Equity and other income, net	(9)	(9)
Operating income	104	87
Net pension and other postretirement plan income	(9)	(2)
Net interest and other financing expenses	16	17
Income before income taxes	97	72
Income tax expense	24	19
Net income	$ 73	$ 53
NET INCOME PER SHARE
Basic (usd per share)	$ 0.39	$ 0.28
Diluted (usd per share)	$ 0.39	$ 0.28
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Basic (shares)	189	188
Diluted (shares)	189	189
COMPREHENSIVE INCOME
Net income	$ 73	$ 53
Other comprehensive income (loss), net of tax
Currency translation adjustments	8	(4)
Amortization of pension and other postretirement plan prior service credit	(2)	(2)
Other comprehensive income (loss)	6	(6)
Comprehensive income	$ 79	$ 47