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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | $ 13 | $ 30
Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 3 | 7
Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 10 | 23
Cost of goods sold | Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 2 | 4
Cost of goods sold | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 11 | 17
Selling, general and administrative expenses | Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 1 | 3
Selling, general and administrative expenses | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | (1) | 4
Amortization expense | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | $ 0 | $ 2

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