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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) Hospital | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital |  | 2 |
Proceeds from sale of business | $ 1,237 | $ 2,160 | $ 68
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | 274 | 394 |
Pretax gain (loss) after tax | 200 | 294 |
Proceeds from sale of business | 326 | 658 |
Discontinued Operations, Disposed of by Sale [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | 1,027 |  |
Pretax gain (loss) after tax | 527 |  |
Proceeds from sale of business | 911 |  |
Hospitals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | $ 67 |
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 |
Hospitals [Member] | 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
Hospitals [Member] | Discontinued Operations, Disposed of by Sale [Member] | Southern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital |  | 2 |
Hospitals [Member] | Discontinued Operations, Disposed of by Sale [Member] | GEORGIA |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | $ 1,226 |
Pretax gain (loss) after tax |  | 920 |
Proceeds from sale of business |  | $ 1,502 |
Number of hospitals sold | Hospital |  | 5 |
Hospitals [Member] | Discontinued Operations, Disposed of by Sale [Member] | Northern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital |  | 3 |
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | 224 | $ 114 |
Fair value of the noncontrolling interest in the acquiree at the acquisition date | 72 | 117 |
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 262 | 1,002 | 279
Hospital and other nonhospital health care entities [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  |  | $ 568
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% |

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