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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total sales	$ 2,048	$ 2,012	$ 3,975	$ 3,842
Income (loss) from operations	264	203	503	395
Interest expense and other, net	(37)	(34)	(76)	(68)
Income before income taxes	227	169	427	327
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,490	1,336	2,812	2,519
Transit Segment
Segment Reporting Information [Line Items]
Total sales	558	676	1,163	1,323
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,502	1,348	2,837	2,543
Income (loss) from operations	233	173	422	315
Interest expense and other, net	0	0	0	0
Income before income taxes	233	173	422	315
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	567	683	1,180	1,340
Income (loss) from operations	50	45	115	115
Interest expense and other, net	0	0	0	0
Income before income taxes	50	45	115	115
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(21)	(19)	(42)	(41)
Income (loss) from operations	(19)	(15)	(34)	(35)
Interest expense and other, net	(37)	(34)	(76)	(68)
Income before income taxes	(56)	(49)	(110)	(103)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	12	12	25	24
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 9	$ 7	$ 17	$ 17

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