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SEGMENT INFORMATION - Summary of Sales by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Total sales	$ 10,387	$ 9,677	$ 8,362
Freight Segment
Revenue from External Customer [Line Items]
Total sales	7,468	6,923	5,979
Transit Segment
Revenue from External Customer [Line Items]
Total sales	2,919	2,754	2,383
Services
Revenue from External Customer [Line Items]
Total sales	1,953	2,030	1,903
Services | Freight Segment
Revenue from External Customer [Line Items]
Total sales	3,381	3,262	2,819
Equipment | Freight Segment
Revenue from External Customer [Line Items]
Total sales	2,108	1,794	1,547
Components | Freight Segment
Revenue from External Customer [Line Items]
Total sales	1,193	1,094	884
Digital Intelligence | Freight Segment
Revenue from External Customer [Line Items]
Total sales	786	773	729
Original Equipment Manufacturer | Transit Segment
Revenue from External Customer [Line Items]
Total sales	1,308	1,264	1,117
Aftermarket | Transit Segment
Revenue from External Customer [Line Items]
Total sales	$ 1,611	$ 1,490	$ 1,266

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