Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Income (Loss) [Abstract]
Sales	$ 489	$ 456
Cost of sales	304	280
Gross profit	185	176
Selling, general and administrative expense	95	87
Non-service income and gains on pension and other postretirement plans	(26)	(2)
Separation costs	6	0
Equity and other income	(10)	(5)
Operating income	120	96
Net interest and other financing expense	10	0
Income before income taxes	110	96
Income tax expense	38	31
Net income	$ 72	$ 65
NET INCOME PER SHARE
Net income per share, basic and diluted (usd per share)	$ 0.35	$ 0.32
AVERAGE SHARES OUTSTANDING
Average shares outstanding, basic and diluted (shares)	205	205
Dividends paid per common share (usd per share)	$ 0.05	$ 0.00
COMPREHENSIVE INCOME (LOSS)
Net income	$ 72	$ 65
Other comprehensive income (loss), net of tax
Unrealized translation loss	(9)	(4)
Pension and other postretirement obligation adjustment	(2)	0
Other comprehensive loss	(11)	(4)
Comprehensive income	$ 61	$ 61