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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Hospital | Sep. 30, 2024 USD ($) Hospital | Dec. 31, 2024 USD ($) | Dec. 31, 2023
Cost of Revenue, Policy [Abstract] |  |  |  |  |  |
Corporate Office Costs | $ 80 | $ 72 | $ 217 | $ 228 |  |
Third Party Reimbursement [Abstract] |  |  |  |  |  |
Amounts due to third party payors | 129 |  | 129 |  | $ 125 |
Amounts due from third party payors | 118 |  | 118 |  | $ 161 |
Net Operating Revenues, Policy [Abstract] |  |  |  |  |  |
Charity care services charges excluded from net operating revenues | 419 | 304 | 1,061 | 906 |  |
Value of charity care services at the Company's standard charges included in contractual allowances | $ 42 | $ 31 | $ 110 | $ 89 |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Number of hospitals sold | Hospital |  |  | 4 | 1 |  |
Net expense |  |  |  | $ 294 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  |  |  |  |  | true
Hospitals Sold or Deemed Held For Sale |  |  |  |  |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | $ 242 | 4 |  |
Gain (loss) on sales of assets and asset impairment charges gross |  |  | 288 |  |  |
Amount related to several assets idled disposed or held for sale |  |  | 15 | 39 |  |
Adjustment for Carrying Value of Other Long-Lived Assets at Underperforming Hospitals |  |  |  |  |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Amount related to several assets idled disposed or held for sale |  |  |  | $ 259 |  |
Impairment of long-lived assets held for sale |  |  | 31 |  |  |
Shared Service Center |  |  |  |  |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | $ 390 |  |  |

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