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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total sales	$ 2,081	$ 1,907	$ 6,056	$ 5,749
Income (loss) from operations	261	217	764	612
Interest expense and other, net	(44)	(42)	(120)	(110)
Income before income taxes	217	175	644	502
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,531	1,295	4,343	3,814
Transit Segment
Segment Reporting Information [Line Items]
Total sales	550	612	1,713	1,935
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(20)	(20)	(62)	(62)
Income (loss) from operations	(25)	(22)	(59)	(57)
Interest expense and other, net	(44)	(42)	(120)	(110)
Income before income taxes	(69)	(64)	(179)	(167)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	13	12	38	37
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	7	8	24	25
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,544	1,307	4,381	3,851
Income (loss) from operations	233	195	655	510
Interest expense and other, net	0	0	0	0
Income before income taxes	233	195	655	510
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	557	620	1,737	1,960
Income (loss) from operations	53	44	168	159
Interest expense and other, net	0	0	0	0
Income before income taxes	$ 53	$ 44	$ 168	$ 159

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