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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total sales	$ 2,644	$ 2,407	$ 5,141	$ 4,601
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,920	1,697	3,744	3,253
Transit Segment
Segment Reporting Information [Line Items]
Total sales	724	710	1,397	1,348
Services
Segment Reporting Information [Line Items]
Total sales	499	508	989	1,018
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	829	810	1,658	1,517
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	570	418	1,096	822
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	322	274	615	532
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	199	195	375	382
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	310	334	620	623
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 414	$ 376	$ 777	$ 725

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