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FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurement, transfers into or out of level 3				$ 0	$ 0
Swap asset	$ 68,000,000			68,000,000
Swap liability	37,000,000	$ 129,000,000		37,000,000		$ 129,000,000
Impairment of indefinite-lived intangible assets	32,000,000	200,000,000	$ 0	32,000,000	$ 0
WCAS, Cohort Of Clinics | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Call option strike price	3,000,000,000	2,500,000,000		3,000,000,000		2,500,000,000
WCAS, Cohort Of Clinics | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Call option strike price	5,000,000,000	3,500,000,000		5,000,000,000		3,500,000,000
Put Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial liability	1,250,000,000	883,000,000		1,250,000,000		883,000,000
Call Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial asset	13,000,000	10,000,000		13,000,000		10,000,000
Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial paper borrowings	0	0		0		0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt outstanding	12,600,000,000	11,700,000,000		12,600,000,000		11,700,000,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt outstanding	12,100,000,000	11,200,000,000		12,100,000,000		11,200,000,000
Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cumulative, aggregate adjustment to the carrying value of senior note	31,000,000			31,000,000
Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	22,421,000,000	21,101,000,000		$ 22,421,000,000		$ 21,101,000,000
Unobservable Inputs (Level 3) | Investments | Fair Value Risk
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk (as percent)				1.80%		1.50%
Unobservable Inputs (Level 3) | Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	$ 394,000,000	$ 322,000,000		$ 394,000,000		$ 322,000,000

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