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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill By Reportable Segments | Changes in the carrying amount of goodwill for our reportable segments for the six months ended June 30, 2017 were as follows:
| Retail |  | Group and Specialty |  | Healthcare Services |  | Total
| (in millions)
Balance at January 1, 2017 | $ | 1,059 |  |  | $ | 261 |  |  | $ | 1,952 |  |  | $ | 3,272 |
Acquisitions | — |  |  | — |  |  | 8 |  |  | 8 |
Balance at June 30, 2017 | $ | 1,059 |  |  | $ | 261 |  |  | $ | 1,960 |  |  | $ | 3,280 |
Details of Intangible Assets Included in Other Long-Term Assets | The following table presents details of our other intangible assets included in other long-term assets in the accompanying condensed consolidated balance sheets at June 30, 2017 and December 31, 2016.
|  |  | June 30, 2017 |  | December 31, 2016
| Weighted Average Life |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
|  |  | ($ in millions)
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer contracts/ relationships | 9.8 years |  | $ | 566 |  |  | $ | 374 |  |  | $ | 192 |  |  | $ | 566 |  |  | $ | 347 |  |  | $ | 219 |
Trade names and technology | 8.2 years |  | 104 |  |  | 75 |  |  | 29 |  |  | 104 |  |  | 69 |  |  | 35 |
Provider contracts | 14.1 years |  | 51 |  |  | 31 |  |  | 20 |  |  | 51 |  |  | 29 |  |  | 22 |
Noncompetes and other | 8.1 years |  | 33 |  |  | 29 |  |  | 4 |  |  | 32 |  |  | 28 |  |  | 4 |
Total other intangible assets | 8.9 years |  | $ | 754 |  |  | $ | 509 |  |  | $ | 245 |  |  | $ | 753 |  |  | $ | 473 |  |  | $ | 280 |
Schedule of Estimated Amortization Expense | The following table presents our estimate of amortization expense for 2017 and each of the five next succeeding years:
| (in millions)
For the years ending December 31,: |
2017 | $ | 71 |
2018 | 63 |
2019 | 52 |
2020 | 48 |
2021 | 14 |
2022 | 11 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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