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INTANGIBLES (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
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, 2019 |  | $ | 6,877 |  |  | $ | 1,484 |  |  | $ | 8,361 |
Additions |  | 2 |  |  | — |  |  | 2 |
Disposals |  | (6) |  |  | — |  |  | (6) |
Foreign currency impact |  | (1) |  |  | 129 |  |  | 128 |
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 |
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,
In millions |  | 2021 |  | 2020
Intellectual property, patents, and other intangibles, net of accumulated amortization of $334 and $223 |  | $ | 977 |  |  | $ | 1,008 |
Backlog, net of accumulated amortization of $309 and $206 |  | 1,114 |  |  | 1,224 |
Customer relationships, net of accumulated amortization of $331 and $276 |  | 979 |  |  | 986 |
Total |  | $ | 3,070 |  |  | $ | 3,218 |
Estimated Amortization Expense Five Succeeding Years | Estimated amortization expense for the five succeeding years is as follows (in millions):
2022 |  | $ | 291 |
2023 |  | $ | 290 |
2024 |  | $ | 281 |
2025 |  | $ | 278 |
2026 |  | $ | 274 |

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