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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($) Hospital | Sep. 30, 2020 USD ($)
Business Acquisitions And Dispositions [Line Items] |  |
Proceeds from sale of business | $ 1,980 | $ 68
Real Estate and Other Investments [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Pretax gain (loss) before tax | 402 | 6
Proceeds from sale of business | $ 473 | 68
Number of hospitals sold | Hospital | 1 |
Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Proceeds from sale of business | $ 647 |
Discontinued Operations, Disposed of by Sale [Member] | Southern Georgia [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Number of hospitals purchased | Hospital | 2 |
Discontinued Operations, Disposed of by Sale [Member] | Georgia [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Pretax gain (loss) before tax | $ 655 |
Proceeds from sale of business | $ 860 |
Number of hospitals sold | Hospital | 4 |
Discontinued Operations, Disposed of by Sale [Member] | Northern Georgia [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Number of hospitals sold | Hospital | 1 |
Hospitals [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Aggregate purchase price | $ 67 |
Number of hospitals purchased | Hospital | 2 |
Hospitals [Member] | Southern Georgia [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Number of hospitals purchased | Hospital | 1 |
Hospitals [Member] | Tennessee [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Number of hospitals purchased | Hospital | 1 |
Other Nonhospital Health Care Entities [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Aggregate purchase price | $ 91 |
Fair value of the noncontrolling interest in the acquiree at the acquisition date | 111 |
Home Health and Hospice [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Goodwill | 601 |
Payment to acquire venture providing post acute care services | $ 330 |
Business acquisition percentage of voting interests acquired | 80.00% |
Fair value of the noncontrolling interest in the acquiree at the acquisition date | $ 101 |
Hospital and other nonhospital health care entities [Member] |  |
Business Acquisitions And Dispositions [Line Items] |  |
Aggregate purchase price |  | $ 380

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