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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 USD ($) Hospital | Sep. 30, 2019 USD ($) Hospital
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital | 1 | 7
Proceeds from sale of business | $ 68 | $ 49
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Gain (loss) on sales of real estate | 6 | 17
Proceeds from sale of business | 68 | 49
Hospitals [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | 1,399
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | $ 193
Hospital and other nonhospital health care entities [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 380 |
Fair value of identifiable net assets | $ 309 |

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