Business Segments Information - Financial Information by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									$ 15,236	$ 13,890	$ 13,020
Sales	$ 4,090	$ 3,946	$ 3,756	$ 3,373	$ 3,892	$ 3,465	$ 3,291	$ 3,156	15,165	13,804	12,932
Property, Plant and Equipment	2,363				2,239				2,363	2,239	2,444
Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									7,808	7,041	6,160
Property, Plant and Equipment	1,442				1,373				1,442	1,373	1,422
AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									4,597	4,260	4,113
Property, Plant and Equipment	428				398				428	398	448
Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									2,831	2,589	2,747
Property, Plant and Equipment	$ 493				$ 468				493	468	574
Intelligent Devices
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									11,588	10,836	10,380
Sales									11,588	10,836	10,380
Intelligent Devices | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									6,079	5,509	4,918
Intelligent Devices | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									3,493	3,375	3,332
Intelligent Devices | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									2,016	1,952	2,130
Intelligent Devices | Operating Segments | Measurement & Analytical
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									3,595	3,215	3,078
Sales									3,595	3,215	3,078
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,847	1,529	1,338
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,222	1,199	1,181
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									526	487	559
Intelligent Devices | Operating Segments | Final Control
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									3,970	3,607	3,488
Sales									3,970	3,607	3,488
Intelligent Devices | Operating Segments | Final Control | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,949	1,706	1,504
Intelligent Devices | Operating Segments | Final Control | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,481	1,373	1,385
Intelligent Devices | Operating Segments | Final Control | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									540	528	599
Intelligent Devices | Operating Segments | Discrete Automation
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									2,635	2,612	2,474
Sales									2,635	2,612	2,474
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,234	1,217	1,084
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									720	732	700
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									681	663	690
Intelligent Devices | Operating Segments | Safety & Productivity
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,388	1,402	1,340
Sales									1,388	1,402	1,340
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,049	1,057	992
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									70	71	66
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									269	274	282
Software and Control
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									3,648	3,054	2,640
Sales									3,648	3,054	2,640
Software and Control | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,729	1,532	1,242
Software and Control | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,104	885	781
Software and Control | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									815	637	617
Software and Control | Operating Segments | AspenTech
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,042	656	319
Sales									1,042	656	319
Software and Control | Operating Segments | AspenTech | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									470	362	200
Software and Control | Operating Segments | AspenTech | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									286	140	60
Software and Control | Operating Segments | AspenTech | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									286	154	59
Software and Control | Operating Segments | Control Systems & Software
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									2,606	2,398	2,321
Sales									2,606	2,398	2,321
Software and Control | Operating Segments | Control Systems & Software | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									1,259	1,170	1,042
Software and Control | Operating Segments | Control Systems & Software | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									818	745	721
Software and Control | Operating Segments | Control Systems & Software | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations									$ 529	$ 483	$ 558