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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,550 | $ 2,081 | $ 7,151 | $ 6,056
Income (loss) from operations | 370 | 261 | 958 | 764
Interest expense and other, net | (50) | (44) | (146) | (120)
Income before income taxes | 320 | 217 | 812 | 644
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,890 | 1,531 | 5,164 | 4,343
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 660 | 550 | 1,987 | 1,713
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (27) | (20) | (79) | (62)
Income (loss) from operations | (25) | (25) | (70) | (59)
Interest expense and other, net | (50) | (44) | (146) | (120)
Income before income taxes | (75) | (69) | (216) | (179)
Corporate Activities and Elimination | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 18 | 13 | 48 | 38
Corporate Activities and Elimination | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 9 | 7 | 31 | 24
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,908 | 1,544 | 5,212 | 4,381
Income (loss) from operations | 327 | 233 | 825 | 655
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | 327 | 233 | 825 | 655
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 669 | 557 | 2,018 | 1,737
Income (loss) from operations | 68 | 53 | 203 | 168
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | $ 68 | $ 53 | $ 203 | $ 168

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