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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2020 |  | $ | 6,872 |  |  | $ | 1,613 |  |  | $ | 8,485 |
Additions |  | 214 |  |  | 15 |  |  | 229 |
Foreign currency impact |  | (13) |  |  | (114) |  |  | (127) |
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 |
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, 2022 |  | December 31, 2021
In millions |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Backlog |  | $ | 1,425 |  |  | $ | (415) |  |  | $ | 1,010 |  |  | $ | 1,423 |  |  | $ | (309) |  |  | $ | 1,114 |
Customer relationships |  | 1,274 |  |  | (362) |  |  | 912 |  |  | 1,310 |  |  | (331) |  |  | 979 |
Acquired technology |  | 1,273 |  |  | (395) |  |  | 878 |  |  | 1,311 |  |  | (334) |  |  | 977 |
Total |  | $ | 3,972 |  |  | $ | (1,172) |  |  | $ | 2,800 |  |  | $ | 4,044 |  |  | $ | (974) |  |  | $ | 3,070 |
Summary of Estimated Amortization Expense Five Succeeding Years | Estimated amortization expense for the five succeeding years is as follows (in millions):
2023 |  | $ | 292 |
2024 |  | $ | 282 |
2025 |  | $ | 266 |
2026 |  | $ | 261 |
2027 |  | $ | 257 |

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