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Acquisitions and Divestitures - Divestitures - Additional Information (Details) $ in Millions |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 22, 2025 USD ($) State | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 | Oct. 31, 2025 USD ($) | Aug. 01, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Total purchase price payable |  | $ 1,012 | $ 174 |  |  |
Subsequent Event |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Base purchase price received |  |  |  |  | $ 91 |
Laboratory Corporation of America Holdings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number states under which subisidiaries of definitive agreement located | State | 13 |  |  |  |  |
Total purchase price payable | $ 195 |  |  |  |  |
Merit Health Biloxi and Merit Health Madison |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of ownership interest sold |  | 50.00% |  |  |  |
Cedar Park Regional Medical Center |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  | 80.00% |  |
Tennova Healthcare |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Base purchase price received |  |  |  |  |  | $ 160

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