Statements of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Sales	$ 2,326	$ 2,493	$ 2,589
Cost of sales	1,619	1,726	1,726
Gross profit	707	767	863
Selling, general and administrative expense	424	453	599
Research and development expense	64	66	73
Intangibles amortization expense	85	86	93
Equity and other income	8	4	4
Goodwill impairment - Note H	530	0	0
Operating income (loss)	(388)	166	102
Net interest and other expense - Note I	119	99	102
Other net periodic benefit income - Note M	2	5	15
Net income (loss) on acquisitions and divestitures - Notes B and C	2	(2)	(4)
Income (loss) from continuing operations before income taxes	(503)	70	11
Income tax expense (benefit) - Note L	(12)	46	(8)
Income (loss) from continuing operations	(491)	24	19
Income (loss) from discontinued operations (net of tax) - Note D	(17)	481	95
Net income (loss)	$ (508)	$ 505	$ 114
Basic earnings per share
Income (loss) from continuing operations	$ (8.10)	$ 0.39	$ 0.30
Income (loss) from discontinued operations	(0.29)	7.76	1.52
Net income (loss)	(8.39)	8.15	1.82
Diluted earnings per share
Income (loss) from continuing operations	(8.10)	0.39	0.29
Income (loss) from discontinued operations	(0.29)	7.64	1.50
Net income (loss)	$ (8.39)	$ 8.03	$ 1.79
COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (508)	$ 505	$ 114
Other comprehensive income (loss), net of tax
Unrealized translation gain (loss)	27	(80)	(82)
Pension and postretirement obligation adjustment	0	(5)	0
Net change in investment securities	0	0	13
Other comprehensive income (loss)	27	(85)	(69)
Comprehensive income (loss)	$ (481)	$ 420	$ 45