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BUSINESS ACQUISITIONS (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2018 | Jun. 18, 2018 | Feb. 01, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  | $ 0 |  | $ 0 | $ 5,000,000 | $ 0 |  |
Goodwill |  |  |  | 6,447,000,000 |  |  | $ 6,447,000,000 |  | $ 6,335,000,000 | $ 6,000,000,000
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life |  |  |  |  |  |  | 18 years |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration |  |  | $ 142,000,000 |  |  |  |  |  |  |
Cash acquired from acquisition |  |  | 5,000,000 |  |  |  |  |  |  |
Cash paid for acquisition |  |  | 130,000,000 |  |  |  |  |  |  |
Intangible assets |  |  | 77,000,000 |  |  |  |  |  |  |
Goodwill |  |  | 57,000,000 |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  | 45,000,000 |  |  |  |  |  |  |
Working capital |  |  | 7,000,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  | 1,000,000 |  |  |  |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Other Operating Income [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Gain due to remeasure |  |  |  | 13,000,000 | $ (1,000,000) |  |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration, liability |  |  | $ 12,000,000 | $ 0 | $ 13,000,000 |  | $ 0 |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life |  |  | 15 years |  |  |  |  |  |  |
Cape Cod Healthcare, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  | $ 35,000,000 |  |  |  |  |  |  |  |
ReproSource, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration | $ 35,000,000 |  |  |  |  |  |  |  |  |
Cash paid for acquisition | 30,000,000 |  |  |  |  |  |  |  |  |
ReproSource, Inc. [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration, liability | $ 5,000,000 |  |  |  |  |  |  |  |  |

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