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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The table below summarizes changes in the carrying amount of goodwill by business segment.
Dollars in millions | Government Solutions |  | Technology Solutions |  | Energy Solutions |  | Total
Balance as of January 1, 2018 | $ | 679 |  |  | $ | 51 |  |  | $ | 238 |  |  | $ | 968 |
Goodwill acquired during the period | 299 |  |  | — |  |  | — |  |  | 299 |
Purchase price adjustment | 2 |  |  | — |  |  | — |  |  | 2 |
Foreign currency translation | (3 | ) |  | — |  |  | (1 | ) |  | (4 | )
Balance as of December 31, 2018 | $ | 977 |  |  | $ | 51 |  |  | $ | 237 |  |  | $ | 1,265 |
Goodwill acquired during the period | $ | — |  |  |  |  |  | $ | — |  |  | $ | — |
Purchase price adjustment | — |  |  | — |  |  | — |  |  | — |
Foreign currency translation | 1 |  |  | (1 | ) |  | — |  |  | — |
Balance as of December 31, 2019 | $ | 978 |  |  | $ | 50 |  |  | $ | 237 |  |  | $ | 1,265 |
Intangible Assets Intangible assets are comprised of customer relationships, trade names, licensing agreements and other. The cost and accumulated amortization of our intangible assets were as follows:
Dollars in millions | December 31, 2019
| Weighted Average Remaining Useful Lives |  | Intangible Assets, Gross |  | Accumulated Amortization |  | Intangible Assets, Net
Trademarks/trade names | Indefinite |  | $ | 61 |  |  | $ | — |  |  | $ | 61 |
Customer relationships | 16 |  | 271 |  |  | (83 | ) |  | 188 |
Developed technologies | 22 |  | 68 |  |  | (36 | ) |  | 32 |
Contract backlog | 19 |  | 255 |  |  | (52 | ) |  | 203 |
Other | 14 |  | 24 |  |  | (13 | ) |  | 11 |
Total intangible assets |  |  | $ | 679 |  |  | $ | (184 | ) |  | $ | 495 |
| December 31, 2018
| Weighted Average Remaining Useful Lives |  | Intangible Assets, Gross |  | Accumulated Amortization |  | Intangible Assets, Net
Trademarks/trade names | Indefinite |  | $ | 61 |  |  | $ | — |  |  | $ | 61 |
Customer relationships | 17 |  | 272 |  |  | (69 | ) |  | 203 |
Developed technologies | 22 |  | 61 |  |  | (34 | ) |  | 27 |
Contract backlog | 20 |  | 249 |  |  | (36 | ) |  | 213 |
Other | 14 |  | 24 |  |  | (12 | ) |  | 12 |
Total intangible assets |  |  | $ | 667 |  |  | $ | (151 | ) |  | $ | 516 |
Intangibles that are not subject to amortization are reviewed annually for impairment or more often if events or circumstances change that would create a triggering event. Intangibles subject to amortization are impaired if the carrying value of the intangible is not recoverable and exceeds its fair value. Our intangibles amortization expense is presented below:
| Years ended December 31,
Dollars in millions | 2019 |  | 2018 |  | 2017
Intangibles amortization expense | $ | 33 |  |  | $ | 32 |  |  | $ | 21 |
Our expected intangibles amortization expense for the next five years is presented below:
Dollars in millions | Expected future intangibles amortization expense
2020 | $ | 32 |
2021 | $ | 28 |
2022 | $ | 23 |
2023 | $ | 23 |
2024 | $ | 23 |
Beyond 2024 | $ | 304 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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