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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total sales	$ 2,081	$ 1,907	$ 6,056	$ 5,749
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,531	1,295	4,343	3,814
Transit Segment
Segment Reporting Information [Line Items]
Total sales	550	612	1,713	1,935
Services
Segment Reporting Information [Line Items]
Total sales	456	418	1,342	1,187
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	669	583	2,046	1,767
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	443	335	1,098	925
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	232	222	695	649
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	187	155	504	473
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	264	287	815	894
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 286	$ 325	$ 898	$ 1,041

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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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