Business Segments Information - Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 1,051	$ 842	$ 762
Capital Expenditures	363	299	404
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and amortization	37	33	70
Capital Expenditures	47	21	19
Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	432	474	494
Capital Expenditures	277	247	362
Intelligent Devices | Operating Segments | Final Control
Segment Reporting Information [Line Items]
Depreciation and amortization	170	212	210
Capital Expenditures	93	62	73
Intelligent Devices | Operating Segments | Measurement & Analytical
Segment Reporting Information [Line Items]
Depreciation and amortization	121	117	128
Capital Expenditures	93	90	130
Intelligent Devices | Operating Segments | Discrete Automation
Segment Reporting Information [Line Items]
Depreciation and amortization	84	88	96
Capital Expenditures	56	68	100
Intelligent Devices | Operating Segments | Safety & Productivity
Segment Reporting Information [Line Items]
Depreciation and amortization	57	57	60
Capital Expenditures	35	27	59
Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	582	335	198
Capital Expenditures	39	31	23
Software and Control | Operating Segments | Control Systems & Software
Segment Reporting Information [Line Items]
Depreciation and amortization	90	93	103
Capital Expenditures	33	27	17
Software and Control | Operating Segments | AspenTech
Segment Reporting Information [Line Items]
Depreciation and amortization	492	242	95
Capital Expenditures	$ 6	$ 4	$ 6