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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 20 | $ 35
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Pretax gain (loss) before tax | 2 | 7
Proceeds from sale of business | 20 | 35
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 22 | $ 328

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