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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 01, 2024 Hospital | Sep. 30, 2024 USD ($) Hospital | Sep. 30, 2023 USD ($) Hospital
Business Acquisition [Line Items] |  |  |
Proceeds from sale of business |  | $ 312 | $ 183
Pretax gain (loss) before tax |  | 209 | 12
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of business |  | 17 | 21
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | 112 | 198
Hospital Facility [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | $ 112 | $ 83
Number of hospitals purchased | Hospital |  | 3 | 1
Proceeds from sale of business |  | $ 295 | $ 162
Number of hospitals sold | Hospital |  | 1 | 2
Hospital Facility [Member] | Subsequent Event [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital | 1 |  |
Effective date of acquired hospital facility | Oct. 01, 2024 |  |

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