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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary 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, 2021 |  | $ | 7,073 |  |  | $ | 1,514 |  |  | $ | 8,587 |
Additions |  | 35 |  |  | — |  |  | 35 |
Foreign currency impact |  | (23) |  |  | (91) |  |  | (114) |
Balance at December 31, 2022 |  | $ | 7,085 |  |  | $ | 1,423 |  |  | $ | 8,508 |
Additions |  | 215 |  |  | — |  |  | 215 |
Disposals |  | (4) |  |  | — |  |  | (4) |
Foreign currency impact |  | 16 |  |  | 45 |  |  | 61 |
Balance at December 31, 2023 |  | $ | 7,312 |  |  | $ | 1,468 |  |  | $ | 8,780 |
Summary of Intangible Assets of the Company, Other Than Goodwill and Trademarks | Intangible assets of the Company, other than goodwill and trade names, consist of the following:
|  | December 31, 2023 |  | December 31, 2022
In millions |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Backlog |  | $ | 1,431 |  |  | $ | (526) |  |  | $ | 905 |  |  | $ | 1,425 |  |  | $ | (415) |  |  | $ | 1,010 |
Customer relationships |  | 1,333 |  |  | (431) |  |  | 902 |  |  | 1,274 |  |  | (362) |  |  | 912 |
Acquired technology |  | 1,283 |  |  | (497) |  |  | 786 |  |  | 1,273 |  |  | (395) |  |  | 878 |
Total |  | $ | 4,047 |  |  | $ | (1,454) |  |  | $ | 2,593 |  |  | $ | 3,972 |  |  | $ | (1,172) |  |  | $ | 2,800 |
Summary of Estimated Amortization Expense Five Succeeding Years | Estimated amortization expense for the five succeeding years is as follows (in millions):
2024 |  | $ | 289 |
2025 |  | $ | 272 |
2026 |  | $ | 267 |
2027 |  | $ | 262 |
2028 |  | $ | 261 |

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