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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Feb. 01, 2018 | Apr. 16, 2014
Fair Value Disclosures [Abstract] |  |  |  |  |
Fair value of debt |  | $ 4,000 | $ 3,900 |  |
Steward Health Care Systems, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability |  |  |  |  | $ 4
Shiel Holdings LLC (Shiel) [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration value high |  | $ 15 |  |  |
Comparable company revenue volatility |  | 6.90% |  |  |
Discount rate |  | 4.50% |  |  |
Shiel Holdings LLC (Shiel) [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability |  | $ 6 | 7 |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability |  |  |  | $ 12 |
Contingent consideration value high |  |  |  | 30 |
Comparable company revenue volatility | 12.70% |  |  |  |
Discount rate | 5.40% |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability |  |  | $ 13 | $ 12 |

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