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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Total net sales | $ 7,822 | $ 7,556 | $ 8,200
Income (loss) from operations | 876 | 745 | 663
Interest expense and other, net | (139) | (188) | (216)
Income (loss) before income taxes | 737 | 557 | 447
Depreciation and amortization | 491 | 473 | 401
Capital expenditures | 130 | 136 | 186
Segment assets | 18,454 | 18,454 |
Freight Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 5,239 | 5,082 | 5,441
Transit Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 2,583 | 2,474 | 2,759
Operating Segments | Freight Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 5,287 | 5,131 | 5,501
Income (loss) from operations | 717 | 584 | 643
Interest expense and other, net | 0 | 0 | 0
Income (loss) before income taxes | 717 | 584 | 643
Depreciation and amortization | 405 | 393 | 330
Capital expenditures | 79 | 70 | 105
Segment assets | 18,291 | 15,393 |
Operating Segments | Transit Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 2,616 | 2,511 | 2,782
Income (loss) from operations | 238 | 230 | 214
Interest expense and other, net | 0 | 0 | 0
Income (loss) before income taxes | 238 | 230 | 214
Depreciation and amortization | 70 | 67 | 62
Capital expenditures | 48 | 40 | 64
Segment assets | 5,768 | 6,395 |
Corporate Activities and Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | (81) | (86) | (83)
Income (loss) from operations | (79) | (69) | (194)
Interest expense and other, net | (139) | (188) | (216)
Income (loss) before income taxes | (218) | (257) | (410)
Depreciation and amortization | 16 | 13 | 9
Capital expenditures | 3 | 26 | 17
Segment assets | (5,605) | (3,334) |
Corporate Activities and Elimination | Freight Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 48 | 49 | 60
Corporate Activities and Elimination | Transit Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | $ 33 | $ 37 | $ 23

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