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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | $ 4 | $ 8 | $ 12 | $ 17
Freight Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | (1) | 2 | 0 | 4
Transit Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | 5 | 6 | 12 | 13
Cost of goods sold | Freight Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | 3 | 1 | 4 | 2
Cost of goods sold | Transit Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | 1 | 3 | 4 | 6
Selling, general and administrative expenses | Freight Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | 0 | 1 | 0 | 2
Selling, general and administrative expenses | Transit Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | 3 | 3 | 6 | 5
Other income, net | Freight Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | (4) | 0 | (4) | 0
Amortization expense | Transit Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Integration 2.0 restructuring charges | $ 1 | $ 0 | $ 2 | $ 2

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