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SEGMENT INFORMATION - Sales by Product (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,081 | $ 1,907 | $ 6,056 | $ 5,749
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,531 | 1,295 | 4,343 | 3,814
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 550 | 612 | 1,713 | 1,935
Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 456 | 418 | 1,342 | 1,187
Services | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 669 | 583 | 2,046 | 1,767
Equipment | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 443 | 335 | 1,098 | 925
Components | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 232 | 222 | 695 | 649
Digital Electronics | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 187 | 155 | 504 | 473
Original Equipment Manufacturer | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 264 | 287 | 815 | 894
Aftermarket | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 286 | $ 325 | $ 898 | $ 1,041

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