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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,644 | $ 2,407 | $ 5,141 | $ 4,601
Income (loss) from operations | 430 | 312 | 842 | 588
Interest expense and other, net | (45) | (53) | (94) | (96)
Income before income taxes | 385 | 259 | 748 | 492
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,920 | 1,697 | 3,744 | 3,253
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 724 | 710 | 1,397 | 1,348
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (22) | (26) | (46) | (51)
Income (loss) from operations | (43) | (25) | (73) | (45)
Interest expense and other, net | (45) | (53) | (94) | (96)
Income before income taxes | (88) | (78) | (167) | (141)
Corporate Activities and Elimination | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 12 | 15 | 25 | 29
Corporate Activities and Elimination | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 10 | 11 | 21 | 22
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,932 | 1,712 | 3,769 | 3,282
Income (loss) from operations | 391 | 269 | 759 | 495
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | 391 | 269 | 759 | 495
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 734 | 721 | 1,418 | 1,370
Income (loss) from operations | 82 | 68 | 156 | 138
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | $ 82 | $ 68 | $ 156 | $ 138

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