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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,048 | $ 2,012 | $ 3,975 | $ 3,842
Income (loss) from operations | 264 | 203 | 503 | 395
Interest expense and other, net | (37) | (34) | (76) | (68)
Income before income taxes | 227 | 169 | 427 | 327
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,490 | 1,336 | 2,812 | 2,519
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 558 | 676 | 1,163 | 1,323
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,502 | 1,348 | 2,837 | 2,543
Income (loss) from operations | 233 | 173 | 422 | 315
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | 233 | 173 | 422 | 315
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 567 | 683 | 1,180 | 1,340
Income (loss) from operations | 50 | 45 | 115 | 115
Interest expense and other, net | 0 | 0 | 0 | 0
Income before income taxes | 50 | 45 | 115 | 115
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (21) | (19) | (42) | (41)
Income (loss) from operations | (19) | (15) | (34) | (35)
Interest expense and other, net | (37) | (34) | (76) | (68)
Income before income taxes | (56) | (49) | (110) | (103)
Corporate Activities and Elimination | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 12 | 12 | 25 | 24
Corporate Activities and Elimination | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 9 | $ 7 | $ 17 | $ 17

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