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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($) Hospital | Jun. 30, 2022 USD ($)
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 172 | $ 20
Pretax gain (loss) before tax | (14) | (22)
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 9 | 20
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 41 | $ 116
Hospital Facility [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 83 |
Proceeds from sale of business | $ 163 |
Number of hospitals sold | Hospital | 2 |

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