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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total sales	$ 2,407	$ 2,048	$ 4,601	$ 3,975
Income (loss) from operations	312	264	588	503
Interest expense and other, net	(53)	(37)	(96)	(76)
Income before income taxes	259	227	492	427
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,708	1,490	3,274	2,812
Transit Segment
Segment Reporting Information [Line Items]
Total sales	699	558	1,327	1,163
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(27)	(21)	(52)	(42)
Income (loss) from operations	(25)	(19)	(45)	(34)
Interest expense and other, net	(53)	(37)	(96)	(76)
Income before income taxes	(78)	(56)	(141)	(110)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	16	12	30	25
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	11	9	22	17
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,724	1,502	3,304	2,837
Income (loss) from operations	271	233	498	422
Interest expense and other, net	0	0	0	0
Income before income taxes	271	233	498	422
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	710	567	1,349	1,180
Income (loss) from operations	66	50	135	115
Interest expense and other, net	0	0	0	0
Income before income taxes	$ 66	$ 50	$ 135	$ 115

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