BUSINESS SEGMENTS - Schedule of Depreciation & Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Segment Reporting [Line Items]
Assets	$ 42,208		$ 42,208		$ 41,964
Depreciation and amortization	377	$ 372	1,105	$ 1,139
Software & Systems
Segment Reporting [Line Items]
Assets	24,396		24,396		24,757
Depreciation and amortization	248	254	734	788
Intelligent Devices
Segment Reporting [Line Items]
Assets	11,833		11,833		11,858
Depreciation and amortization	90	88	271	263
Operating Segments \| Safety & Productivity
Segment Reporting [Line Items]
Assets	1,891		1,891		1,931
Depreciation and amortization	27	19	66	56
Operating Segments \| Software & Systems \| Control Systems & Software
Segment Reporting [Line Items]
Assets	15,824		15,824		15,948
Depreciation and amortization	128	135	374	432
Operating Segments \| Software & Systems \| Test & Measurement
Segment Reporting [Line Items]
Assets	8,572		8,572		8,809
Depreciation and amortization	120	119	360	356
Operating Segments \| Intelligent Devices \| Sensors
Segment Reporting [Line Items]
Assets	4,250		4,250		4,253
Depreciation and amortization	34	32	101	95
Operating Segments \| Intelligent Devices \| Final Control
Segment Reporting [Line Items]
Assets	7,583		7,583		7,605
Depreciation and amortization	56	56	170	168
Corporate
Segment Reporting [Line Items]
Assets	4,088		4,088		$ 3,418
Depreciation and amortization	$ 12	$ 11	$ 34	$ 32