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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total sales	$ 2,048	$ 2,012	$ 3,975	$ 3,842
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,490	1,336	2,812	2,519
Transit Segment
Segment Reporting Information [Line Items]
Total sales	558	676	1,163	1,323
Services
Segment Reporting Information [Line Items]
Total sales	464	424	886	769
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	711	622	1,377	1,184
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	381	328	655	590
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	234	224	463	427
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	164	162	317	318
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	259	320	551	607
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 299	$ 356	$ 612	$ 716

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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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