OTHER FINANCIAL INFORMATION - Schedule of Goodwill by Business Segment (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Goodwill [Line Items]
Goodwill	$ 18,182	$ 18,193
Software & Systems
Goodwill [Line Items]
Goodwill	12,559	12,563
Software & Systems | Control Systems & Software
Goodwill [Line Items]
Goodwill	9,096	9,095
Software & Systems | Test & Measurement
Goodwill [Line Items]
Goodwill	3,463	3,468
Intelligent Devices
Goodwill [Line Items]
Goodwill	4,998	5,004
Intelligent Devices | Sensors
Goodwill [Line Items]
Goodwill	1,602	1,604
Intelligent Devices | Final Control
Goodwill [Line Items]
Goodwill	3,396	3,400
Safety & Productivity
Goodwill [Line Items]
Goodwill	$ 625	$ 626