Business Segment Information - Depreciation and Amortization for Reportable Segments and Corporate (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Purchase accounting depreciation and amortization	$ 32	$ 35
Total	79	78
Operating Segments
Segment Reporting Information [Line Items]
Total	47	43
Operating Segments | Intelligent Devices
Segment Reporting Information [Line Items]
Total	17	18
Operating Segments | Software & Control
Segment Reporting Information [Line Items]
Total	20	14
Operating Segments | Lifecycle Services
Segment Reporting Information [Line Items]
Total	9	10
Corporate
Segment Reporting Information [Line Items]
Total	$ 1	$ 1