BUSINESS ACQUISITIONS (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 01, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Cash acquired from acquisition		$ 4	$ 0
Business acquisitions, net of cash acquired		105	$ 0
Goodwill		$ 7,197		$ 7,095	$ 6,873
Customer Relationships
Business Acquisition [Line Items]
Intangible assets, useful life		17 years
Pack Health, LLC
Business Acquisition [Line Items]
Consideration	$ 123
Cash acquired from acquisition	4
Business acquisitions, net of cash acquired	105
Contingent consideration	18
Goodwill	96
Goodwill, expected tax deductible amount	78
Intangible assets	30
Operating lease right-of-use assets	5
Operating lease liabilities	5
Working capital	$ (3)
Pack Health, LLC | Customer Relationships
Business Acquisition [Line Items]
Intangible assets, useful life	15 years
Labtech Diagnostics, LLC
Business Acquisition [Line Items]
Goodwill, purchase adjustments		$ 7
Increase to the estimated contingent consideration liability		10
Labtech Diagnostics, LLC | Customer Relationships
Business Acquisition [Line Items]
Intangible assets, purchase adjustments		$ 3