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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total sales	$ 2,886	$ 2,663	$ 8,202	$ 7,804
Freight Segment
Segment Reporting Information [Line Items]
Total sales	2,093	1,930	5,913	5,674
Transit Segment
Segment Reporting Information [Line Items]
Total sales	793	733	2,289	2,130
Services
Segment Reporting Information [Line Items]
Total sales	461	492	1,394	1,481
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	744	842	2,388	2,317
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	677	513	1,699	1,609
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	375	371	1,157	1,169
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	297	204	669	579
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	367	349	1,042	969
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 426	$ 384	$ 1,247	$ 1,161

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