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NET OPERATING REVENUES - Net Operating Revenue Composition, Ambulatory and Conifer Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 5,289	$ 5,126	$ 15,783	$ 15,602
Ambulatory Care
Disaggregation of Revenue [Line Items]
Net operating revenues	1,275	1,139	3,739	3,275
Ambulatory Care | Net patient service revenues
Disaggregation of Revenue [Line Items]
Net operating revenues	1,222	1,098	3,579	3,152
Ambulatory Care | Other revenues
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 53	$ 41	$ 160	$ 123

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