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REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Change in estimate, revenue and receivables | $ 35 |  |  |
Percentage of net revenues |  | 100.00% | 100.00% | 100.00%
Healthcare Insurers [Member] | Minimum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 30 days |  |
Healthcare Insurers [Member] | Maximum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 60 days |  |
Government Payers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 30 days |  |
Client Payers [Member] | Minimum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 60 days |  |
Client Payers [Member] | Maximum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 90 days |  |
Patient [Member] | Minimum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 30 days |  |
Patient [Member] | Maximum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 60 days |  |
DS Businesses [Member] | Minimum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 30 days |  |
DS Businesses [Member] | Maximum [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Collection of consideration |  | 60 days |  |
DIS business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues from the DIS business |  | 95.00% | 95.00% | 95.00%
Percentage of net revenues |  | 96.00% | 96.00% | 95.00%
DIS business [Member] | Healthcare Insurers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 35.00% | 37.00% | 38.00%
DIS business [Member] | Healthcare Insurers [Member] | Fee-for-service [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 32.00% | 34.00% | 34.00%
DIS business [Member] | Healthcare Insurers [Member] | Capitated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 3.00% | 3.00% | 4.00%
DIS business [Member] | Government Payers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 16.00% | 17.00% | 17.00%
DIS business [Member] | Client Payers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 32.00% | 30.00% | 29.00%
DIS business [Member] | Patient [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Period of billing fully reserve |  | 210 days |  |
Percentage of net revenues |  | 13.00% | 12.00% | 11.00%
All other operating segments [Member] | DS Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues |  | 4.00% | 4.00% | 5.00%

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