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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Change in the Carrying Amount of Goodwill by Segment | The change in the carrying amount of goodwill by segment is as follows:
In millions | Freight Segment |  | Transit Segment |  | Total
Balance at December 31, 2024 | $ | 7,248 |  |  | $ | 1,462 |  |  | $ | 8,710 |
Additions/adjustments | 949 |  |  | — |  |  | 949 |
Foreign currency impact | 14 |  |  | 180 |  |  | 194 |
Balance at September 30, 2025 | $ | 8,211 |  |  | $ | 1,642 |  |  | $ | 9,853 |
Schedule of Intangible Assets of the Company, Other Than Goodwill and Trade Names | Intangible assets of the Company, other than goodwill and trade names, consist of the following:
|  | September 30, 2025 |  | December 31, 2024
In millions |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Backlog |  | $ | 1,312 |  |  | $ | (591) |  |  | $ | 721 |  |  | $ | 1,415 |  |  | $ | (629) |  |  | $ | 786 |
Customer relationships |  | 1,780 |  |  | (537) |  |  | 1,243 |  |  | 1,329 |  |  | (480) |  |  | 849 |
Acquired technology |  | 1,495 |  |  | (701) |  |  | 794 |  |  | 1,318 |  |  | (614) |  |  | 704 |
Total |  | $ | 4,587 |  |  | $ | (1,829) |  |  | $ | 2,758 |  |  | $ | 4,062 |  |  | $ | (1,723) |  |  | $ | 2,339 |
Schedule of Amortization Expense | Amortization expense for the five succeeding years is estimated to be as follows:
In millions |
Remainder of 2025 | $ | 79 |
2026 | $ | 310 |
2027 | $ | 306 |
2028 | $ | 304 |
2029 | $ | 303 |

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