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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total sales	$ 2,497	$ 2,194
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,824	1,556
Transit Segment
Segment Reporting Information [Line Items]
Total sales	673	638
Services
Segment Reporting Information [Line Items]
Total sales	490	510
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	829	707
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	526	404
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	293	258
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	176	187
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	310	289
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 363	$ 349

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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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