REVENUE (Details) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Sales Commission Amortization Period Minimum	1 year
Percent of Revenue Contributed	100.00%	100.00%	100.00%
Sales Commission Amortization Period Maximum	5 years
Revenues	$ 14,876,800,000	$ 16,120,900,000	$ 13,978,500,000
Percent of Domestic Revenue	77.50%	77.90%	80.10%
Amortization of Deferred Sales Commissions	$ 33,900,000	$ 27,500,000	$ 23,200,000
Accrued Sales Commission	38,200,000	36,200,000
Capitalized Contract Cost, Net	15,000,000.0	14,400,000
Amount of Deferred Costs Related to Long-term Contracts	53,200,000	50,600,000
Capitalized Contract Cost, Amortization	12,400,000	14,200,000	10,100,000
Contract with Customer, Asset, before Allowance for Credit Loss	805,900,000	730,800,000
Allowance for Credit Loss, Receivable, Other, Current	(10,500,000)	(14,000,000.0)
Contract with Customer, Asset, after Allowance for Credit Loss, Current	795,400,000	716,800,000
Contract with Customer, Liability	582,100,000	558,500,000
Deferred Revenue, Revenue Recognized	330,500,000	319,400,000	262,600,000
Revenue, Remaining Performance Obligation, Amount	$ 5,122,100,000
Percent of remaining performance obligations recognized as revenue in next year	30.00%
Long Term Contracts Duration Minimum	1 year
Long Term Contracts Duration Maximum	8 years
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 73,000,000.0	69,800,000
Accounts Receivable, Allowance for Credit Loss	43,500,000	21,500,000	22,100,000
Unbilled Services, Allowance for Credit Loss	10,500,000	13,900,000	11,300,000
Note Receivable, Allowance for Credit Loss	700,000	700,000	5,700,000
Allowance for Credit Loss	54,700,000	36,100,000	39,100,000
Accounts Receivable, Credit Loss Expense (Reversal)	15,100,000	3,800,000
Unbilled Services, Credit Loss Expense (Reversal)	0	2,700,000
Note Receivable, Credit Loss Expense (Reversal)	0	(5,000,000.0)
Credit Loss Expense (Reversal)	15,100,000	1,500,000
Allowance for Credit Loss, Write Off	3,500,000	4,500,000
Geographic Distribution, Domestic [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 11,530,500,000	$ 12,566,200,000	$ 11,192,300,000
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	6.00%	7.00%	7.00%
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	13.00%	13.00%	11.00%
North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	80.00%	81.00%	82.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	6.00%	7.00%
Covance Drug Development [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed		36.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	39.00%	36.00%	35.00%
Covance Drug Development [Member] \| Europe [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	13.00%	13.00%	11.00%
Covance Drug Development [Member] \| North America \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	19.00%	17.00%	17.00%
Covance Drug Development [Member] \| Other countries [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	6.00%	7.00%
LabCorp Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	61.00%	64.00%	65.00%
LabCorp Diagnostics [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	31.00%	34.00%	32.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	6.00%	6.00%	6.00%
LabCorp Diagnostics [Member] \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	18.00%	17.00%	20.00%
LabCorp Diagnostics [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	61.00%	64.00%	65.00%
LabCorp Diagnostics [Member] \| North America \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	31.00%	34.00%	32.00%
LabCorp Diagnostics [Member] \| North America \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	6.00%	7.00%	7.00%
LabCorp Diagnostics [Member] \| North America \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	6.00%	6.00%	6.00%
LabCorp Diagnostics [Member] \| North America \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	18.00%	17.00%	20.00%
LabCorp Diagnostics [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Other countries [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Other countries [Member] \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
Maximum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	5 years
Minimum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	2 years
Accounts Receivable [Member]
Allowance for Credit Loss, Write Off	$ 6,900,000	$ 4,400,000
Unbilled Contracts Receivable
Allowance for Credit Loss, Write Off	3,400,000	100,000
Notes Receivable
Allowance for Credit Loss, Write Off	$ 0	$ 0

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