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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 USD ($) Hospital | Mar. 31, 2024 USD ($) Hospital
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 161 | $ 310
Hospital Facility [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 190 | $ 50
Number of hospitals purchased | Hospital | 2 | 2
Number of hospitals sold | Hospital | 1 | 1
Proceeds from sale of business | $ 157 | $ 297
Pretax gain (loss) before tax | 4 | 193
Healthcare Entity [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 37 | 46
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 1 | 13
Pretax gain (loss) before tax |  | $ 8

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