Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 2,757	$ 3,087	$ 8,547	$ 9,379
Medicare
Disaggregation of Revenue [Line Items]
Net operating revenues	469	527	1,429	1,660
Medicare Managed Care
Disaggregation of Revenue [Line Items]
Net operating revenues	524	531	1,625	1,681
Medicaid
Disaggregation of Revenue [Line Items]
Net operating revenues	447	505	1,464	1,527
Managed Care and Other Third Party Payors
Disaggregation of Revenue [Line Items]
Net operating revenues	1,269	1,500	3,911	4,449
Self-Pay
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 48	$ 24	$ 118	$ 62

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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