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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,550	$ 2,081	$ 7,151	$ 6,056
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,890	1,531	5,164	4,343
Transit Segment
Segment Reporting Information [Line Items]
Total sales	660	550	1,987	1,713
Services
Segment Reporting Information [Line Items]
Total sales	502	456	1,520	1,342
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	787	669	2,304	2,046
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	615	443	1,423	1,098
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	307	232	874	695
Digital Intelligence | Freight Segment
Segment Reporting Information [Line Items]
Total sales	181	187	563	504
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	302	264	909	815
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 358	$ 286	$ 1,078	$ 898

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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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