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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) Hospital | Dec. 31, 2023 USD ($) | Dec. 31, 2022
Cost of Revenue, Policy [Abstract] |  |  |  |  |  |
Corporate Office Costs | $ 72 | $ 61 | $ 228 | $ 187 |  |
Third Party Reimbursement [Abstract] |  |  |  |  |  |
Amounts due to third party payors | 138 |  | 138 |  | $ 97 |
Amounts due from third party payors | 146 |  | 146 |  | $ 130 |
Net Operating Revenues, Policy [Abstract] |  |  |  |  |  |
Charity care services charges excluded from net operating revenues | 304 | 355 | 906 | 1,000 |  |
Value of charity care services at the Company's standard charges included in contractual allowances | $ 31 | $ 39 | 89 | $ 111 |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Net expense |  |  | 294 |  |  |
Number of hospitals sold | Hospital |  |  |  | 3 |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  | true
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 |  |  | 4 | $ 9 |  |
Amount related to several assets idled disposed or held for sale |  |  | 39 | 8 |  |
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 | 25 |  |
Impairment of long-lived assets held for sale |  |  |  | 21 |  |
Shared Service Center |  |  |  |  |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | $ 127 | $ 84 |  |

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