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Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 3,133	$ 3,140	$ 6,292	$ 6,279
Medicare
Disaggregation of Revenue [Line Items]
Net operating revenues	542	563	1,132	1,159
Medicare Managed Care
Disaggregation of Revenue [Line Items]
Net operating revenues	547	560	1,150	1,139
Medicaid
Disaggregation of Revenue [Line Items]
Net operating revenues	545	465	1,022	906
Managed Care and Other Third Party Payors
Disaggregation of Revenue [Line Items]
Net operating revenues	1,481	1,501	2,950	2,980
Self-Pay
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 18	$ 51	$ 38	$ 95

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