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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2015 | Apr. 18, 2014 | Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jan. 02, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash received in connection with call option exercise price |  |  |  | $ 51,000,000 | $ 0 |  |
Contingent consideration, liability |  | $ 26,000,000 |  |  |  |  |
Fair value of debt |  |  | $ 3,800,000,000 | 3,800,000,000 |  | $ 4,200,000,000 |
Fair value in excess of carrying value of debt |  |  | 116,000,000 | 116,000,000 |  | 416,000,000 |
Contingent Consideration [Member] | Other Operating (Income) Expense [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Included in earnings |  |  | 0 | 0 |  |  |
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% |  |  |  |  |
Subsidiaries [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Deferred consideration | $ 50,000,000 |  |  |  |  |  |
Cash received in connection with call option exercise price | $ 50,000,000 |  |  |  |  |  |
Summit Health, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  |  | 0 | 0 |  | $ 13,000,000 |
Contingent consideration value high |  | $ 25,000,000 |  |  |  |  |
Steward Health Care Systems, LLC [Member] [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration value high |  |  | $ 4,000,000 | $ 4,000,000 |  |  |
UMass [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of equity interest expected to be divested |  |  |  |  |  |  | 18.90%
Ownership percentage by noncontrolling owners | 18.90% |  |  |  |  |  |
UMass [Member] | Subsidiaries [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 18.90% |  |  |  |  |  |

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