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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Total sales | $ 2,194 | $ 1,927
Income (loss) from operations | 276 | 239
Interest expense and other, net | (43) | (39)
Income before income taxes | 233 | 200
Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,566 | 1,322
Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 628 | 605
Corporate Activities and Elimination |  |
Segment Reporting Information [Line Items] |  |
Total sales | (25) | (21)
Income (loss) from operations | (20) | (15)
Interest expense and other, net | (43) | (39)
Income before income taxes | (63) | (54)
Corporate Activities and Elimination | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 14 | 13
Corporate Activities and Elimination | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 11 | 8
Operating Segments | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,580 | 1,335
Income (loss) from operations | 227 | 189
Interest expense and other, net | 0 | 0
Income before income taxes | 227 | 189
Operating Segments | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 639 | 613
Income (loss) from operations | 69 | 65
Interest expense and other, net | 0 | 0
Income before income taxes | $ 69 | $ 65

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