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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Hospital | Dec. 31, 2020 USD ($) Hospital | Dec. 31, 2019 USD ($) Hospital
Business Acquisition [Line Items] |  |  |
Proceeds from sale of business | $ 2,160 | $ 68 | $ 61
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | 394 |  |
Pretax gain (loss) after tax | 294 |  |
Proceeds from sale of business | $ 658 |  |
Discontinued Operations, Disposed of by Sale [Member] | Louisiana [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  |  | 18
Pretax gain (loss) after tax |  |  | 13
Proceeds from sale of business |  |  | $ 61
Number of hospitals sold | Hospital |  |  | 1
Discontinued Operations, Disposed of by Sale [Member] | Mississippi [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | (7) |
Pretax gain (loss) after tax |  | (9) |
Proceeds from sale of business |  | $ 68 |
Number of hospitals sold | Hospital |  | 1 |
Discontinued Operations, Disposed of by Sale [Member] | Southern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital | 2 |  |
Discontinued Operations, Disposed of by Sale [Member] | TENNESSEE |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) after tax | $ 920 |  |
Discontinued Operations, Disposed of by Sale [Member] | GEORGIA, REPUBLIC OF |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | 1,226 |  |
Proceeds from sale of business | $ 1,502 |  |
Number of hospitals sold | Hospital | 5 |  |
Discontinued Operations, Disposed of by Sale [Member] | Northern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital | 3 |  |
Hospitals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 67 |  | $ 1,384
Number of hospitals purchased | Hospital | 2 | 1 | 7
Hospitals [Member] | Southern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital | 1 |  |
Hospitals [Member] | TENNESSEE |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital | 1 |  |
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  |  | $ 298
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,002 | $ 279 | $ 332
Hospital and other nonhospital health care entities [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | $ 568 |
Number of hospitals purchased | Hospital |  | 1 |
Urgent Care Centers [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | 594 |  |
Home Health And Hospice [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of the noncontrolling interest in the acquiree at the acquisition date | 100 |  |
Payment to acquire venture providing post acute care services | $ 330 |  |
Business acquisition percentage of voting interests acquired | 80.00% |  |
Other Nonhospital Health Care Entities [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 114 |  |
Fair value of the noncontrolling interest in the acquiree at the acquisition date | $ 117 |  |

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