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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total sales	$ 2,644	$ 2,407	$ 5,141	$ 4,601
Income (loss) from operations	430	312	842	588
Interest expense and other, net	(45)	(53)	(94)	(96)
Income before income taxes	385	259	748	492
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,920	1,697	3,744	3,253
Transit Segment
Segment Reporting Information [Line Items]
Total sales	724	710	1,397	1,348
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(22)	(26)	(46)	(51)
Income (loss) from operations	(43)	(25)	(73)	(45)
Interest expense and other, net	(45)	(53)	(94)	(96)
Income before income taxes	(88)	(78)	(167)	(141)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	12	15	25	29
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	10	11	21	22
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,932	1,712	3,769	3,282
Income (loss) from operations	391	269	759	495
Interest expense and other, net	0	0	0	0
Income before income taxes	391	269	759	495
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	734	721	1,418	1,370
Income (loss) from operations	82	68	156	138
Interest expense and other, net	0	0	0	0
Income before income taxes	$ 82	$ 68	$ 156	$ 138

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