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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Reportable Segments | The changes in the carrying amount of goodwill in each of the Company’s reportable segments for the years ended December 31, 2021 and 2020 were as follows:
Dollars in millions | Government Solutions |  | Sustainable Technology Solutions |  | Total
Balance as of January 1, 2020 | $ | 978 |  |  | $ | 287 |  |  | $ | 1,265 |
Goodwill acquired during the period (Note 4) | 589 |  |  | — |  |  | 589 |
Goodwill reallocation | 19 |  |  | (19) |  |  | — |
Impairment loss | — |  |  | (99) |  |  | (99) |
Foreign currency translation | 3 |  |  | 3 |  |  | 6 |
Balance as of January 1, 2021 | $ | 1,589 |  |  | $ | 172 |  |  | $ | 1,761 |
Goodwill acquired during the period (Note 4) | 306 |  |  | — |  |  | 306 |
Foreign currency translation | (5) |  |  | (2) |  |  | (7) |
Balance as of December 31, 2021 | $ | 1,890 |  |  | $ | 170 |  |  | $ | 2,060 |
Summary of Cost and Accumulated Amortization of Intangible Assets | The cost and accumulated amortization of our intangible assets were as follows:
Dollars in millions | December 31, 2021
| Weighted Average Remaining Useful Lives |  | Intangible Assets, Gross |  | Accumulated Amortization |  | Intangible Assets, Net
Trademarks/trade names | Indefinite |  | $ | 50 |  |  | $ | — |  |  | $ | 50 |
Customer relationships | 14 |  | 546 |  |  | (124) |  |  | 422 |
Developed technologies | 18 |  | 75 |  |  | (39) |  |  | 36 |
Contract backlog | 18 |  | 303 |  |  | (113) |  |  | 190 |
Other | 11 |  | 25 |  |  | (15) |  |  | 10 |
Total intangible assets |  |  | $ | 999 |  |  | $ | (291) |  |  | $ | 708 |
| December 31, 2020
| Weighted Average Remaining Useful Lives |  | Intangible Assets, Gross |  | Accumulated Amortization |  | Intangible Assets, Net
Trademarks/trade names | Indefinite |  | $ | 50 |  |  | $ | — |  |  | $ | 50 |
Customer relationships | 15 |  | 470 |  |  | (100) |  |  | 370 |
Developed technologies | 19 |  | 75 |  |  | (37) |  |  | 38 |
Contract backlog | 18 |  | 291 |  |  | (76) |  |  | 215 |
Other | 13 |  | 25 |  |  | (15) |  |  | 10 |
Total intangible assets |  |  | $ | 911 |  |  | $ | (228) |  |  | $ | 683 |
Summary of Amortization Expense of Intangible Assets | Our intangibles amortization expense is presented below:
| Years ended December 31,
Dollars in millions | 2021 |  | 2020 |  | 2019
Intangibles amortization expense | $ | 66 |  |  | $ | 42 |  |  | $ | 33 |
Summary of Expected Amortization Expense of Intangibles | Our expected intangibles amortization expense for the next five years is presented below:
Dollars in millions | Expected future intangibles amortization expense
2022 | $ | 51 |
2023 | $ | 43 |
2024 | $ | 42 |
2025 | $ | 42 |
2026 | $ | 42 |
Beyond 2026 | $ | 438 |

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