Other Operating Income, Net and Other Non-Operating Income (Expense), Net - Other Operating Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment
Finance charges	$ 16	$ 17	$ 18
Gains on sales of fixed assets, net	22	61	33
Foreign currency transaction gains (losses)	2	7	(5)
Cylinder deposit income	17	23	18
Interest and interest-related income	11	6	1
Other, net	(6)	18	14
Total other operating income, net	$ 62	132	$ 79
Building
Property, Plant and Equipment
Gains on sales of fixed assets, net		$ 15