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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of Significant Accounting Policies [Line Items] |  |  |
Equity method investments carrying value | $ 473 | $ 46 |
Share of equity earnings from investments in affiliates | $ 23 | $ 26 | $ 24
Percentage of total revenues generated by medicaid and medicare programs | 17.00% | 17.00% | 18.00%
Purchase price discount ESPP | 15.00% |  |
Percentage of accounts receivable due from government payers | 16.00% | 14.00% |
Percentage of receivables due from patients | 17.00% | 17.00% |
Available-for-sale equity securities | $ 6 | $ 9 |
Trading equity securities | 49 | 49 |
Other investments | 8 | 8 |
Total | 63 | 66 |
Gross unrealized gains from available-for-sale equity securities | 2 |  |
Trading equity securities gain or (loss) | 0 | 3 | $ 7
Unamortized debt issuance expense | 25 | 20 |
Deferred tax liabilities, net, noncurrent | (157) | (204) |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Unamortized debt issuance expense |  | $ 20 |
Deferred tax assets, net, current | 168 |  |
Deferred tax assets, net, noncurrent | 26 |  |
Deferred tax liabilities, net, noncurrent | $ 142 |  |
Minimum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Finite-lived intangible asset, useful life | 5 years |  |
Maximum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 49.00% |  |
Finite-lived intangible asset, useful life | 20 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 31 years 6 months |  |
Laboratory Equipment and Furniture and Fixtures [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Laboratory Equipment and Furniture and Fixtures [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |
Internal Use Software [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Internal Use Software [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |

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