Restructuring Costs - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) facilty position	Sep. 30, 2022 USD ($) position facilty	Sep. 30, 2021 USD ($) facilty position	Sep. 30, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 72	$ 75	$ 132
Number of positions eliminated | position	700	2,150	3,000
Total number of facilities exited | facilty	10	7	5
Cost of Sales and Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 20	$ 40	$ 34
Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring costs, expected future cost				$ 160