Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 3,946	$ 3,465	$ 11,075	$ 9,912
Earnings	761	378	1,822	1,829
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT)	0	0	0	453
Income (Loss) from Equity Method Investments	(61)	0	(61)	0
Interest expense	(10)	(50)	(111)	(140)
Gain (loss) on sale of business	10,576	0	13,359	0
RUSSIAN FEDERATION
Segment Reporting Information [Line Items]
Gain (loss) on sale of business	(47)	162		162
Operating Segments [Member] | Measurement & Analytical Instrumentation [Member]
Segment Reporting Information [Line Items]
Net sales	913	788	2,550	2,294
Earnings	257	189	661	535
Operating Segments [Member] | Final Control
Segment Reporting Information [Line Items]
Net sales	1,035	905	2,889	2,606
Earnings	245	150	618	424
Operating Segments [Member] | Discrete Automation
Segment Reporting Information [Line Items]
Net sales	668	633	1,969	1,894
Earnings	124	115	378	365
Operating Segments [Member] | Safety & Productivity [Member]
Segment Reporting Information [Line Items]
Net sales	363	360	1,034	1,066
Earnings	82	69	228	199
Operating Segments [Member] | Intelligent Devices
Segment Reporting Information [Line Items]
Net sales	2,979	2,686	8,442	7,860
Earnings	708	523	1,885	1,523
Operating Segments [Member] | AspenTech
Segment Reporting Information [Line Items]
Net sales	320	239	793	405
Earnings	27	57	(60)	51
Operating Segments [Member] | Control Systems & Software
Segment Reporting Information [Line Items]
Net sales	663	568	1,892	1,711
Earnings	144	77	378	294
Operating Segments [Member] | Software and Control
Segment Reporting Information [Line Items]
Net sales	983	807	2,685	2,116
Earnings	171	134	318	345
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Stock compensation	(56)	(15)	(198)	(92)
Unallocated pension and postretirement costs	42	25	133	76
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT)	0	0	0	453
Income (Loss) from Equity Method Investments	(61)	0	(61)	0
Corporate and other [Member]
Segment Reporting Information [Line Items]
Earnings	(43)	(239)	(154)	(336)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(16)	(28)	(52)	(64)
Interest expense	(10)	(50)	(111)	(140)
Interest income from related party	$ 10	$ 0	$ 10