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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total sales	$ 2,610	$ 2,497
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,901	1,824
Transit Segment
Segment Reporting Information [Line Items]
Total sales	709	673
Services
Segment Reporting Information [Line Items]
Total sales	453	490
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	863	738
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	476	526
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	381	384
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	181	176
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	322	310
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 387	$ 363

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