SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Advertising cost	$ 74,000,000	$ 78,000,000	$ 38,000,000
Summary of Significant Accounting Policies [Line Items]
Equity method investments carrying value	$ 132,000,000	$ 141,000,000
Percentage of net revenues	100.00%	100.00%	100.00%
Share of equity earnings from investments in affiliates	$ 44,000,000	$ 78,000,000	$ 75,000,000
Percentage of net accounts receivable	100.00%	100.00%
Operating income (loss)	$ 1,428,000,000	$ 2,381,000,000	1,971,000,000
Net income	1,015,000,000	2,080,000,000	1,499,000,000
Trading equity securities gain or (loss)	(55,000,000)	56,000,000	8,000,000
Impairment charges	0	0	$ 0
Equity Securities without readily determinable fair value	4,000,000	4,000,000
Available-for-sale debt securities	2,000,000	1,000,000
Operating lease right-of-use assets	585,000,000	597,000,000
Operating lease, liability	642,000,000
Recurring Basis
Summary of Significant Accounting Policies [Line Items]
Available-for-sale debt securities	2,000,000	1,000,000
Equity investments		44,000,000
Deferred compensation trading securities	$ 68,000,000	$ 77,000,000
DIS business
Summary of Significant Accounting Policies [Line Items]
Percentage of net revenues	97.00%	97.00%	97.00%
Percentage of net accounts receivable	96.00%	97.00%
Operating income (loss)	$ 1,704,000,000	$ 2,646,000,000	$ 2,201,000,000
DIS business | Government payers
Summary of Significant Accounting Policies [Line Items]
Percentage of net revenues	11.00%	10.00%	11.00%
Percentage of net accounts receivable	6.00%	6.00%
DIS business | Patients (including coinsurance and deductible responsibilities)
Summary of Significant Accounting Policies [Line Items]
Percentage of net revenues	12.00%	12.00%	11.00%
Percentage of net accounts receivable	18.00%	21.00%
Minimum
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	5 years
Minimum | Laboratory Equipment and Furniture and Fixtures
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Minimum | Software and Software Development Costs
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Minimum | DIS business
Summary of Significant Accounting Policies [Line Items]
Percentage of net revenues	95.00%	95.00%	95.00%
Maximum
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	20 years
Maximum | Building and Building Improvements
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	31 years 6 months
Maximum | Laboratory Equipment and Furniture and Fixtures
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	12 years
Maximum | Software and Software Development Costs
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Substantial Ownership Interest | Minimum
Summary of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	20.00%
Substantial Ownership Interest | Maximum
Summary of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	49.00%