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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) Hospital | Mar. 31, 2019 USD ($) Hospital
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital | 1 | 7
Proceeds from sale of business | $ 35 | $ 30
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Gain (loss) on sales of real estate |  | 5
Hospitals [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | 1,398
Hospitals [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisition [Line Items] |  |
Gain (loss) on sales of real estate | 7 | (1)
Proceeds from sale of business | 35 | 25
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | $ 76
Hospital and other nonhospital health care entities [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 328 |
Fair value of identifiable net assets | $ 296 |

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