REVENUES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	100.00%	100.00%	100.00%
Revenues	$ 13,008.9	$ 12,161.6	$ 11,863.9
Percent of Domestic Revenue	83.50%	83.70%	83.70%
Sales Commission Amortization Period Minimum	1 year
Sales Commission Amortization Period Maximum	5 years
Geographic Distribution, Domestic [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 10,858.3	$ 10,177.7	$ 9,930.3
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%
North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	87.00%	87.00%	87.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	4.00%	4.00%
LabCorp Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	78.00%	77.00%	77.00%
LabCorp Diagnostics [Member] | Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	36.00%	36.00%	39.00%
LabCorp Diagnostics [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	10.00%	9.00%	8.00%
LabCorp Diagnostics [Member] | Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	24.00%	24.00%	22.00%
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	78.00%	77.00%	77.00%
LabCorp Diagnostics [Member] | North America | Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	36.00%	36.00%	39.00%
LabCorp Diagnostics [Member] | North America | Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%
LabCorp Diagnostics [Member] | North America | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	10.00%	9.00%	8.00%
LabCorp Diagnostics [Member] | North America | Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	24.00%	24.00%	22.00%
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%
LabCorp Diagnostics [Member] | Other countries [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] | Other countries [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%
Biopharma Laboratory Services
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	22.00%	23.00%	23.00%
Biopharma Laboratory Services | Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	22.00%	23.00%	23.00%
Biopharma Laboratory Services | Europe [Member] | Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%
Biopharma Laboratory Services | North America | Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	10.00%	10.00%
Biopharma Laboratory Services | Other countries [Member] | Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	4.00%	4.00%