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SUBSEQUENT EVENTS (Details) - USD ($)		1 Months Ended	3 Months Ended
	Apr. 06, 2020	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Cash paid for business acquisitions			$ 111,000,000	$ 56,000,000
Goodwill			6,694,000,000							$ 6,619,000,000	$ 6,563,000,000
Credit Facilities
Subsequent Event [Line Items]
Amount borrowed			$ 0
Senior Unsecured Revolving Credit Facility | Maximum
Subsequent Event [Line Items]
Leverage ratio			350.00%
Scenario, Forecast | Senior Unsecured Revolving Credit Facility | Maximum
Subsequent Event [Line Items]
Leverage ratio					450.00%	625.00%	650.00%	550.00%	500.00%
Subsequent Event
Subsequent Event [Line Items]
CARES Act, amount received from initial tranche		$ 65,000,000
Subsequent Event | Fixed-to-variable interest rate swaps
Subsequent Event [Line Items]
Proceeds from derivative		40,000,000
Subsequent Event | Secured Receivables Credit Facility
Subsequent Event [Line Items]
Amount borrowed		100,000,000
Subsequent Event | Senior Unsecured Revolving Credit Facility
Subsequent Event [Line Items]
Amount borrowed		$ 100,000,000
Subsequent Event | Laboratory Services Business, Memorial Hermann
Subsequent Event [Line Items]
Cash paid for business acquisitions	$ 120,000,000
Goodwill	90,000,000
Subsequent Event | Laboratory Services Business, Memorial Hermann | Customer-Related Intangible Assets
Subsequent Event [Line Items]
Intangible assets	$ 30,000,000

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