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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Total sales | $ 2,497 | $ 2,194
Income (loss) from operations | 412 | 276
Interest expense and other, net | (49) | (43)
Income before income taxes | 363 | 233
Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,824 | 1,556
Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 673 | 638
Corporate Activities and Elimination |  |
Segment Reporting Information [Line Items] |  |
Total sales | (24) | (25)
Income (loss) from operations | (30) | (20)
Interest expense and other, net | (49) | (43)
Income before income taxes | (79) | (63)
Corporate Activities and Elimination | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 13 | 14
Corporate Activities and Elimination | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 11 | 11
Operating Segments | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,837 | 1,570
Income (loss) from operations | 368 | 226
Interest expense and other, net | 0 | 0
Income before income taxes | 368 | 226
Operating Segments | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 684 | 649
Income (loss) from operations | 74 | 70
Interest expense and other, net | 0 | 0
Income before income taxes | $ 74 | $ 70

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