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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,550	$ 2,081	$ 7,151	$ 6,056
Income (loss) from operations	370	261	958	764
Interest expense and other, net	(50)	(44)	(146)	(120)
Income before income taxes	320	217	812	644
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,890	1,531	5,164	4,343
Transit Segment
Segment Reporting Information [Line Items]
Total sales	660	550	1,987	1,713
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(27)	(20)	(79)	(62)
Income (loss) from operations	(25)	(25)	(70)	(59)
Interest expense and other, net	(50)	(44)	(146)	(120)
Income before income taxes	(75)	(69)	(216)	(179)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	18	13	48	38
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	9	7	31	24
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,908	1,544	5,212	4,381
Income (loss) from operations	327	233	825	655
Interest expense and other, net	0	0	0	0
Income before income taxes	327	233	825	655
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	669	557	2,018	1,737
Income (loss) from operations	68	53	203	168
Interest expense and other, net	0	0	0	0
Income before income taxes	$ 68	$ 53	$ 203	$ 168

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