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GOODWILL AND INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2026
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, 2025 | $ | 8,567 |  |  | $ | 1,649 |  |  | $ | 10,216 |
Additions/adjustments | 6 |  |  | 475 |  |  | 481 |
Foreign currency impact | (12) |  |  | (60) |  |  | (72) |
Balance at March 31, 2026 | $ | 8,561 |  |  | $ | 2,064 |  |  | $ | 10,625 |
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:
|  | March 31, 2026 |  | December 31, 2025
In millions |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Backlog |  | $ | 1,366 |  |  | $ | (639) |  |  | $ | 727 |  |  | $ | 1,311 |  |  | $ | (613) |  |  | $ | 698 |
Customer relationships |  | 2,278 |  |  | (570) |  |  | 1,708 |  |  | 2,000 |  |  | (550) |  |  | 1,450 |
Acquired technology |  | 1,669 |  |  | (771) |  |  | 898 |  |  | 1,570 |  |  | (731) |  |  | 839 |
Total |  | $ | 5,313 |  |  | $ | (1,980) |  |  | $ | 3,333 |  |  | $ | 4,881 |  |  | $ | (1,894) |  |  | $ | 2,987 |
Schedule of Amortization Expense | Amortization expense for the five succeeding years is estimated to be as follows:
In millions |
Remainder of 2026 | $ | 270 |
2027 | $ | 356 |
2028 | $ | 354 |
2029 | $ | 352 |
2030 | $ | 339 |

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