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RESTRUCTURING (Details) - Integration 2.0 $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) facility employee
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring period |  | 3 years |
Restructuring charges | $ 9 | $ 0 | $ 78
Number of facilities to be closed | facility |  |  | 15
Number of positions eliminated | employee |  |  | 1,100
Transit Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 7 |  |
Freight Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 2 |  |
Cost of Goods Sold |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 4 |  |
Selling, General and Administrative Expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 5 |  |
Minimum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  | 135 |
Maximum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  | $ 165 |

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