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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Total sales	$ 7,822	$ 7,556	$ 8,200
Freight Segment
Revenue from External Customer [Line Items]
Total sales	5,239	5,082	5,441
Transit Segment
Revenue from External Customer [Line Items]
Total sales	2,583	2,474	2,759
Services
Revenue from External Customer [Line Items]
Total sales	1,617	1,323	1,292
Services | Freight Segment
Revenue from External Customer [Line Items]
Total sales	2,430	2,068	1,991
Equipment | Freight Segment
Revenue from External Customer [Line Items]
Total sales	1,302	1,531	1,700
Components | Freight Segment
Revenue from External Customer [Line Items]
Total sales	867	819	1,073
Digital Electronics | Freight Segment
Revenue from External Customer [Line Items]
Total sales	640	664	677
Original Equipment Manufacturer | Transit Segment
Revenue from External Customer [Line Items]
Total sales	1,193	1,139	1,287
Aftermarket | Transit Segment
Revenue from External Customer [Line Items]
Total sales	$ 1,390	$ 1,335	$ 1,472

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