Other Operating Income, Net and Other Non-Operating Income (Expense), Net - Other Operating Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment
Finance charges	$ 17	$ 18	$ 17
Gains on sales of fixed assets, net	61	33	11
Gain on early derivative termination	0	0	5
Foreign currency transaction gains (losses)	7	(5)	0
Cylinder deposit income	23	18	9
Interest and interest-related income	6	1	0
Other, net	18	14	(9)
Total other operating income, net	132	$ 79	$ 33
Building
Property, Plant and Equipment
Gains on sales of fixed assets, net	$ 15