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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,194	$ 1,927
Income (loss) from operations	276	239
Interest expense and other, net	(43)	(39)
Income before income taxes	233	200
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,566	1,322
Transit Segment
Segment Reporting Information [Line Items]
Total sales	628	605
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(25)	(21)
Income (loss) from operations	(20)	(15)
Interest expense and other, net	(43)	(39)
Income before income taxes	(63)	(54)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	14	13
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	11	8
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,580	1,335
Income (loss) from operations	227	189
Interest expense and other, net	0	0
Income before income taxes	227	189
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	639	613
Income (loss) from operations	69	65
Interest expense and other, net	0	0
Income before income taxes	$ 69	$ 65

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