BUSINESS ACQUISITIONS - Amortizable Assets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Business Acquisition [Line Items]
Total	$ 641
Customer related
Business Acquisition [Line Items]
Total	$ 542
Customer related | Minimum
Business Acquisition [Line Items]
Weighted Average Useful Life (in years)	15 years
Customer related | Maximum
Business Acquisition [Line Items]
Weighted Average Useful Life (in years)	25 years
Trade name
Business Acquisition [Line Items]
Total	$ 99
Weighted Average Useful Life (in years)	15 years
LifeLabs Inc.
Business Acquisition [Line Items]
Total	$ 434
LifeLabs Inc. | Customer related
Business Acquisition [Line Items]
Total	335
LifeLabs Inc. | Trade name
Business Acquisition [Line Items]
Total	99
Laboratory Business of Three Physician Groups in New York
Business Acquisition [Line Items]
Total	57
Laboratory Business of Three Physician Groups in New York | Customer related
Business Acquisition [Line Items]
Total	57
Laboratory Business of Three Physician Groups in New York | Trade name
Business Acquisition [Line Items]
Total	0
Select Assets of the Outreach Laboratory Services Business of Allina Health
Business Acquisition [Line Items]
Total	55
Select Assets of the Outreach Laboratory Services Business of Allina Health | Customer related
Business Acquisition [Line Items]
Total	55
Select Assets of the Outreach Laboratory Services Business of Allina Health | Trade name
Business Acquisition [Line Items]
Total	0
Other Acquisitions
Business Acquisition [Line Items]
Total	95
Other Acquisitions | Customer related
Business Acquisition [Line Items]
Total	95
Other Acquisitions | Trade name
Business Acquisition [Line Items]
Total	$ 0