BUSINESS ACQUISITIONS (Details) - USD ($) $ in Millions								12 Months Ended
	Feb. 01, 2022	Dec. 13, 2021	Jun. 01, 2021	Aug. 01, 2020	Jul. 31, 2020	Apr. 06, 2020	Jan. 21, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Total consideration								$ 162	$ 346	$ 330
Goodwill acquired during the year								121	228	247
Goodwill deductible for tax purposes								103	221	210
Finite-lived intangibles								45	107	146
Cash acquired from acquisition								4	0	21
Business acquisitions, net of cash acquired								144	331	330
Goodwill								7,220	7,095	6,873
Goodwill acquired, before adjustments									236
Cash consideration								$ 148	$ 331	351
Revenues										$ 127
Customer - related
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life								17 years
Technology-Based Intangible Assets
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life								15 years
Pack Health, LLC
Business Acquisition [Line Items]
Total consideration	$ 123
Goodwill deductible for tax purposes	78
Cash acquired from acquisition	4
Business acquisitions, net of cash acquired	105
Contingent consideration	18
Goodwill	96
Finite-lived intangibles	30
Operating lease right-of-use assets	5
Operating lease liabilities	5
Working capital	$ (3)
Pack Health, LLC | Customer - related
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	15 years
Mercy Health
Business Acquisition [Line Items]
Goodwill deductible for tax purposes			$ 171
Cash consideration			225
Mercy Health | Customer - related
Business Acquisition [Line Items]
Finite-lived intangibles			$ 54
Finite-lived intangible asset, useful life			15 years
Labtech Diagnostics, LLC
Business Acquisition [Line Items]
Total consideration		$ 95
Goodwill deductible for tax purposes		33
Contingent consideration		15
Goodwill		48
Operating lease right-of-use assets		6
Operating lease liabilities		6
Cash consideration		80
Property, plant and equipment, net		11
Finance lease liabilities		9
Inventories		1
Labtech Diagnostics, LLC | Customer - related
Business Acquisition [Line Items]
Finite-lived intangibles		$ 44
Finite-lived intangible asset, useful life		15 years
Blueprint Genetics Oy
Business Acquisition [Line Items]
Goodwill deductible for tax purposes							$ 66
Cash acquired from acquisition							3
Business acquisitions, net of cash acquired							108
Goodwill							66
Finite-lived intangibles							43
Property, plant, and equipment and working capital							$ 2
Blueprint Genetics Oy | Customer - related
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							15 years
Blueprint Genetics Oy | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							10 years
Memorial Hermann
Business Acquisition [Line Items]
Goodwill deductible for tax purposes						$ 93
Cash consideration						120
Memorial Hermann | Customer - related
Business Acquisition [Line Items]
Finite-lived intangibles						$ 27
Finite-lived intangible asset, useful life						15 years
Mid America Clinical Laboratories, LLC (MACL)
Business Acquisition [Line Items]
Goodwill deductible for tax purposes				$ 47
Cash acquired from acquisition				18
Business acquisitions, net of cash acquired				93
Goodwill				84
Working capital				11
Property, plant and equipment, net				$ 11
Percentage of voting interests acquired				56.00%
Equity interest in acquiree, percentage					44.00%
Equity interest in acquiree, fair value					$ 87
Equity interest in acquiree, long-term growth rate used to determine fair value				1.50%
Equity interest in acquiree, discount rate used to determine fair value				7.50%
Mid America Clinical Laboratories, LLC (MACL) | Other Income (Expense)
Business Acquisition [Line Items]
Equity interest in acquiree, remeasurement gain				$ 70
Mid America Clinical Laboratories, LLC (MACL) | Customer - related
Business Acquisition [Line Items]
Finite-lived intangibles				$ 74
Finite-lived intangible asset, useful life				15 years