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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,407 | $ 2,048 | $ 4,601 | $ 3,975
Income (loss) from operations | 312 | 264 | 588 | 503
Interest expense and other, net | (53) | (37) | (96) | (76)
Income before income taxes | 259 | 227 | 492 | 427
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,708 | 1,490 | 3,274 | 2,812
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 699 | 558 | 1,327 | 1,163
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (27) | (21) | (52) | (42)
Income (loss) from operations | (25) | (19) | (45) | (34)
Interest expense and other, net | (53) | (37) | (96) | (76)
Income before income taxes | (78) | (56) | (141) | (110)
Corporate Activities and Elimination | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 16 | 12 | 30 | 25
Corporate Activities and Elimination | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 11 | 9 | 22 | 17
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,724 | 1,502 | 3,304 | 2,837
Income (loss) from operations | 271 | 233 | 498 | 422
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | 271 | 233 | 498 | 422
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 710 | 567 | 1,349 | 1,180
Income (loss) from operations | 66 | 50 | 135 | 115
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | $ 66 | $ 50 | $ 135 | $ 115

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