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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of 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 |
Expected Expense Related to Intangibles Amortization in Future Periods | 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 Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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