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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2015 | Apr. 18, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 16, 2014 | Jan. 02, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of debt |  |  | $ 3,700 | $ 4,200 |  |  |
Contingent consideration |  | $ 26 |  |  |  |  |
Deferred consideration |  |  | 51 | 0 | $ 0 |  |
Sale of noncontrolling interest in subsidiary |  |  | 63 | 0 | $ 0 |  |
UMass Joint Venture [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 18.90% |  |  |  |  |  |
Sale of noncontrolling interest in subsidiary | $ 50 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value inputs, probability of occurrence |  | 5.00% |  |  |  |  |
Discount rate |  | 1.50% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value inputs, probability of occurrence |  | 95.00% |  |  |  |  |
Discount rate |  | 2.80% |  |  |  |  |
UMass [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of equity interest expected to be divested |  |  |  |  |  |  | 18.90%
Deferred consideration | $ 50 |  |  |  |  |  |
Summit Health, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  | $ 22 |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  | $ 25 |  |  |  |  |
Summit Health, Inc. [Member] | Contingent Consideration [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Included in earnings |  |  | 13 | 9 |  |  |
Summit Health, Inc. [Member] | To be Paid in 2016 Based on Revenue Targets [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  | 0 | $ 13 |  |  |
Steward Health Care Systems, LLC [Member] [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 4 |
Contingent consideration arrangements, range of outcomes, value, high |  |  | $ 4 |  |  |  |

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