Discontinued Operations - Reconciliation of Consolidated Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group
Pretax income of discontinued operations	$ 2	$ 1,068	$ 25
Income from discontinued operations	10	746	47
Performance Adhesives [Member]
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group
Sales		171	372
Cost of sales		(122)	(256)
Selling, general and administrative expense		(12)	(25)
Research and development expense		(4)	(8)
Intangible amortization expense		0	(1)
Pretax operating income of discontinued operations		33	82
Other net periodic benefit loss (income)		0	(1)
Pretax income of discontinued operations	(1)	33	83
Benefit (expense) related to income (loss) from discontinued operations	6	8	(19)
Income from discontinued operations		41	64
Composites/Marl facility [Member]
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group
Pretax income of discontinued operations	(1)	0	(1)
Benefit (expense) related to income (loss) from discontinued operations	$ 0	$ 2	$ 1