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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 20 | $ 30
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 20 | 30
Pretax gain (loss) before tax | (22) | 10
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 116 |
Nonhospital Health Care [Member] | GEORGIA, REPUBLIC OF |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | $ 98

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