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SEGMENT INFORMATION - Summary of Sales by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Total sales	$ 8,362	$ 7,822	$ 7,556
Freight Segment
Revenue from External Customer [Line Items]
Total sales	6,012	5,239	5,082
Transit Segment
Revenue from External Customer [Line Items]
Total sales	2,350	2,583	2,474
Services
Revenue from External Customer [Line Items]
Total sales	1,903	1,617	1,323
Services | Freight Segment
Revenue from External Customer [Line Items]
Total sales	2,819	2,430	2,068
Equipment | Freight Segment
Revenue from External Customer [Line Items]
Total sales	1,528	1,302	1,531
Components | Freight Segment
Revenue from External Customer [Line Items]
Total sales	936	867	819
Digital Electronics | Freight Segment
Revenue from External Customer [Line Items]
Total sales	729	640	664
Original Equipment Manufacturer | Transit Segment
Revenue from External Customer [Line Items]
Total sales	1,095	1,193	1,139
Aftermarket | Transit Segment
Revenue from External Customer [Line Items]
Total sales	$ 1,255	$ 1,390	$ 1,335

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