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SEGMENT INFORMATION - Sales by Product (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
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
Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 502 | 456 | 1,520 | 1,342
Services | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 787 | 669 | 2,304 | 2,046
Equipment | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 615 | 443 | 1,423 | 1,098
Components | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 307 | 232 | 874 | 695
Digital Intelligence | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 181 | 187 | 563 | 504
Original Equipment Manufacturer | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 302 | 264 | 909 | 815
Aftermarket | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 358 | $ 286 | $ 1,078 | $ 898

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