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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The following summarizes goodwill and other intangible assets:
|  | December 31, 2018 | December 31, 2017
(in millions) | Weighted Average Amortization Period | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
Goodwill |  | $ | 289 |  | $ | — |  | $ | 289 |  | $ | 289 |  | $ | — |  | $ | 289 |
Amortizable intangibles: |  |  |  |  |  |  |
Customer contracts | 10 years | 90 |  | (71 | ) | 19 |  | 210 |  | (187 | ) | 23 |
Developed technology | 5 years | 5 |  | (3 | ) | 2 |  | 6 |  | (3 | ) | 3 |
Total |  | $ | 95 |  | $ | (74 | ) | $ | 21 |  | $ | 216 |  | $ | (190 | ) | $ | 26 |
Amortization of intangible assets during the years ended December 31, 2018, 2017 and 2016 was $5 million, $5 million and $16 million, respectively. As of December 31, 2018, we had $120 million of fully amortized customer contracts and $1 million of fully amortized developed technology. We evaluate the remaining useful life of intangible assets annually to determine whether events and circumstances warrant a revision to the estimated remaining useful life. Expense related to intangibles amortization in future periods as of December 31, 2018 is expected to be as follows:
Year ending December 31: | Amount (in millions)
2019 | $ | 5 |
2020 | 5 |
2021 | 4 |
2022 | 4 |
2023 | 3 |
Total | $ | 21 |

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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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