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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets The following table summarizes the changes in goodwill by operating segment ($ in millions):
| Managed Care |  | Specialty Services |  | Total
Balance as of December 31, 2016 | $ | 4,015 |  |  | $ | 697 |  |  | $ | 4,712 |
Acquisitions and purchase accounting adjustments | — |  |  | 37 |  |  | 37 |
Balance as of December 31, 2017 | 4,015 |  |  | 734 |  |  | 4,749 |
Acquisitions and purchase accounting adjustments | 1,671 |  |  | 595 |  |  | 2,266 |
Balance as of December 31, 2018 | $ | 5,686 |  |  | $ | 1,329 |  |  | $ | 7,015 |
The majority of the increase in the managed care segment goodwill was related to the acquisition and fair value allocations discussed in Note 3. Fidelis Care Acquisition. The majority of the increase in the specialty services segment goodwill related to other acquisitions discussed in Note 11. Stockholders' Equity. Intangible assets at December 31, consist of the following ($ in millions):
|  |  |  |  | Weighted Average Life in Years
| 2018 |  | 2017 |  | 2018 |  | 2017
Purchased contract rights | $ | 1,173 |  |  | $ | 1,173 |  |  | 12.6 |  | 12.6
Provider contracts | 311 |  |  | 274 |  |  | 12.3 |  | 11.9
Customer relationships | 769 |  |  | 22 |  |  | 10.9 |  | 8.2
Trade names | 361 |  |  | 162 |  |  | 15.2 |  | 9.6
Developed technologies | 180 |  |  | 109 |  |  | 5.2 |  | 5.0
Other Intangibles | 5 |  |  | 7 |  |  | 2.7 |  | 2.8
Intangible assets | 2,799 |  |  | 1,747 |  |  | 11.9 |  | 11.6
Less accumulated amortization: |  |  |  |  |  |  |
Purchased contract rights | (283 | ) |  | (188 | ) |  |  |  |
Provider contracts | (90 | ) |  | (66 | ) |  |  |  |
Customer relationships | (57 | ) |  | (21 | ) |  |  |  |
Trade names | (55 | ) |  | (34 | ) |  |  |  |
Developed technologies | (72 | ) |  | (40 | ) |  |  |  |
Other Intangibles | (3 | ) |  | — |  |  |  |  |
Total accumulated amortization | (560 | ) |  | (349 | ) |  |  |  |
Intangible assets, net | $ | 2,239 |  |  | $ | 1,398 |  |  |  |  |
Amortization expense was $211 million, $156 million and $147 million for the years ended December 31, 2018, 2017 and 2016, respectively. Estimated total amortization expense related to intangible assets for each of the five succeeding fiscal years is as follows ($ in millions):
Year |  | Expense
2019 |  | $ | 252 |
2020 |  | 244 |
2021 |  | 223 |
2022 |  | 217 |
2023 |  | 214 |

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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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