Restructuring Costs - Schedule Of Restructuring Expense by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 72	$ 75	$ 132
Corporate and other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	14	13	5
Intelligent Devices
Restructuring Cost and Reserve [Line Items]
Restructuring costs	48	51	114
Intelligent Devices | Operating Segments | Measurement & Analytical
Restructuring Cost and Reserve [Line Items]
Restructuring costs	9	3	58
Intelligent Devices | Operating Segments | Final Control
Restructuring Cost and Reserve [Line Items]
Restructuring costs	12	38	41
Intelligent Devices | Operating Segments | Discrete Automation
Restructuring Cost and Reserve [Line Items]
Restructuring costs	27	0	11
Intelligent Devices | Operating Segments | Safety & Productivity
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	10	4
Software and Control
Restructuring Cost and Reserve [Line Items]
Restructuring costs	10	11	13
Software and Control | Operating Segments | AspenTech
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1	0	2
Software and Control | Operating Segments | Control Systems & Software
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 9	$ 11	$ 11