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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
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-Publisher FASB
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