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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total sales	$ 2,663	$ 2,550	$ 7,804	$ 7,151
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,930	1,881	5,674	5,134
Transit Segment
Segment Reporting Information [Line Items]
Total sales	733	669	2,130	2,017
Services
Segment Reporting Information [Line Items]
Total sales	492	502	1,481	1,520
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	917	787	2,575	2,304
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	513	620	1,609	1,442
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	296	293	911	825
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	204	181	579	563
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	349	308	969	931
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 384	$ 361	$ 1,161	$ 1,086

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