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REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Percentage of net revenues		100.00%	100.00%	100.00%
Change in estimate, revenue and receivables	$ 35
Percentage of net accounts receivable	100.00%	100.00%	100.00%
Healthcare insurers: | Minimum
Segment Reporting Information [Line Items]
Collection of consideration		30 days
Healthcare insurers: | Maximum
Segment Reporting Information [Line Items]
Collection of consideration		60 days
Government payers
Segment Reporting Information [Line Items]
Collection of consideration		30 days
Client payers | Minimum
Segment Reporting Information [Line Items]
Collection of consideration		60 days
Client payers | Maximum
Segment Reporting Information [Line Items]
Collection of consideration		90 days
Patients | Minimum
Segment Reporting Information [Line Items]
Collection of consideration		30 days
Patients | Maximum
Segment Reporting Information [Line Items]
Collection of consideration		60 days
DS | Minimum
Segment Reporting Information [Line Items]
Collection of consideration		30 days
DS | Maximum
Segment Reporting Information [Line Items]
Collection of consideration		60 days
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues		96.00%	96.00%	96.00%
Percentage of net accounts receivable	96.00%	95.00%	96.00%
DIS business | Minimum
Segment Reporting Information [Line Items]
Percentage of net revenues		95.00%	95.00%	95.00%
DIS business | Healthcare insurers:
Segment Reporting Information [Line Items]
Percentage of net revenues		36.00%	35.00%	37.00%
Percentage of net accounts receivable	22.00%	22.00%	22.00%
DIS business | Healthcare insurers: | Fee-for-service
Segment Reporting Information [Line Items]
Percentage of net revenues		33.00%	32.00%	34.00%
DIS business | Healthcare insurers: | Capitated
Segment Reporting Information [Line Items]
Percentage of net revenues		3.00%	3.00%	3.00%
DIS business | Government payers
Segment Reporting Information [Line Items]
Percentage of net revenues		15.00%	16.00%	17.00%
Percentage of net accounts receivable	13.00%	11.00%	13.00%
DIS business | Client payers
Segment Reporting Information [Line Items]
Percentage of net revenues		32.00%	32.00%	30.00%
Percentage of net accounts receivable	41.00%	42.00%	41.00%
DIS business | Patients
Segment Reporting Information [Line Items]
Percentage of net revenues		13.00%	13.00%	12.00%
Period of billing fully reserve		210 days
Percentage of net accounts receivable	20.00%	20.00%	20.00%
All other operating segments | DS
Segment Reporting Information [Line Items]
Percentage of net revenues		4.00%	4.00%	4.00%
Percentage of net accounts receivable	4.00%	5.00%	4.00%

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