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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 18, 2014 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 07, 2017 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Other operating (expense) income, net |  |  | $ (1) | $ 13 | $ (11) |  |
Fair value of debt |  | $ 4,000 | 4,000 | $ 3,900 |  |  |
Summit Health, Inc. and Steward Health Care Systems, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated fair value of contingent consideration | $ 26 |  |  |  |  |  |
Summit Health, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  |  | $ 0
Other operating (expense) income, net |  |  |  |  | $ 13 |  |
Steward Health Care Systems, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  | $ 1 | 1 |  |  |  |
Shiel Holdings LLC (Shiel) [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  | $ 6 |
Discount rate |  | 4.50% |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  | $ 15 | 15 |  |  |  |
Comparable company revenue volatility |  | 6.90% |  |  |  |  |
Shiel Holdings LLC (Shiel) [Member] | Level 3 [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  | $ 6 | $ 6 |  |  |  |
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% |  |  |  |  |  |

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