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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2023 Hospital | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022
Cost of Revenue, Policy [Abstract] |  |  |  |  |
Corporate Office Costs |  | $ 82 | $ 61 |  |
Third Party Reimbursement [Abstract] |  |  |  |  |
Amounts due to third party payors |  | 74 |  | $ 97 |
Amounts due from third party payors |  | 131 |  | $ 130 |
Net Operating Revenues, Policy [Abstract] |  |  |  |  |
Charity care services charges excluded from net operating revenues |  | 316 | 326 |  |
Value of charity care services at the Company's standard charges included in contractual allowances |  | 30 | 38 |  |
Accounting for the Impairment or Disposal of Long-Lived Assets |  |  |  |  |
Number of hospitals sold | Hospital | 1 |  |  |  |
Amount related to several assets idled disposed or held for sale |  |  | 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 |  |  | 22 |  |
Gain Loss On Sales Of Assets And Asset Impairment Charges Gross |  |  | $ 25 |  |
Impairment of amount related to several assets idled disposed or held for sale |  | $ 17 |  |  |

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