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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,194	$ 1,927
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,566	1,322
Transit Segment
Segment Reporting Information [Line Items]
Total sales	628	605
Services
Segment Reporting Information [Line Items]
Total sales	510	422
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	707	666
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	393	274
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	279	229
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	187	153
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	282	292
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 346	$ 313

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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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