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SEGMENT INFORMATION - Summary of Sales by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Total sales	$ 9,677	$ 8,362	$ 7,822
Freight Segment
Revenue from External Customer [Line Items]
Total sales	6,962	6,012	5,239
Transit Segment
Revenue from External Customer [Line Items]
Total sales	2,715	2,350	2,583
Services
Revenue from External Customer [Line Items]
Total sales	2,030	1,903	1,617
Services | Freight Segment
Revenue from External Customer [Line Items]
Total sales	3,262	2,819	2,430
Equipment | Freight Segment
Revenue from External Customer [Line Items]
Total sales	1,770	1,528	1,302
Components | Freight Segment
Revenue from External Customer [Line Items]
Total sales	1,157	936	867
Digital Intelligence | Freight Segment
Revenue from External Customer [Line Items]
Total sales	773	729	640
Original Equipment Manufacturer | Transit Segment
Revenue from External Customer [Line Items]
Total sales	1,235	1,095	1,193
Aftermarket | Transit Segment
Revenue from External Customer [Line Items]
Total sales	$ 1,480	$ 1,255	$ 1,390

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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