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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,407	$ 2,048	$ 4,601	$ 3,975
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,708	1,490	3,274	2,812
Transit Segment
Segment Reporting Information [Line Items]
Total sales	699	558	1,327	1,163
Services
Segment Reporting Information [Line Items]
Total sales	508	464	1,018	886
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	810	711	1,517	1,377
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	415	381	808	655
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	288	234	567	463
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	195	164	382	317
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	325	259	607	551
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 374	$ 299	$ 720	$ 612

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