REVENUE RECOGNITION (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
Net accounts receivable	100.00%		100.00%		100.00%
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	97.00%	97.00%	97.00%	97.00%
Net accounts receivable	97.00%		97.00%		96.00%
DIS business | Healthcare Insurers
Segment Reporting Information [Line Items]
Percentage of net revenues	39.00%	40.00%	39.00%	40.00%
Net accounts receivable	26.00%		26.00%		24.00%
DIS business | Healthcare Insurers | Fee-for-service
Segment Reporting Information [Line Items]
Percentage of net revenues	36.00%	37.00%	36.00%	37.00%
DIS business | Healthcare Insurers | Capitated
Segment Reporting Information [Line Items]
Percentage of net revenues	3.00%	3.00%	3.00%	3.00%
DIS business | Government Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	11.00%	12.00%	12.00%	12.00%
Net accounts receivable	7.00%		7.00%		7.00%
DIS business | Client Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	33.00%	33.00%	33.00%	33.00%
Net accounts receivable	42.00%		42.00%		45.00%
DIS business | Patients (including coinsurance and deductible responsibilities)
Segment Reporting Information [Line Items]
Percentage of net revenues	14.00%	12.00%	13.00%	12.00%
Net accounts receivable	22.00%		22.00%		20.00%
DIS business | Minimum
Segment Reporting Information [Line Items]
Percentage of net revenues	95.00%	95.00%	95.00%	95.00%
All other operating segments | DS Businesses
Segment Reporting Information [Line Items]
Percentage of net revenues	3.00%	3.00%	3.00%	3.00%
Net accounts receivable	3.00%		3.00%		4.00%