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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Total sales | $ 2,497 | $ 2,194
Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,824 | 1,556
Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 673 | 638
Services |  |
Segment Reporting Information [Line Items] |  |
Total sales | 490 | 510
Services | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 829 | 707
Equipment | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 526 | 404
Components | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 293 | 258
Digital Intelligence | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 176 | 187
Original Equipment Manufacturer | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 310 | 289
Aftermarket | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | $ 363 | $ 349

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