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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) Hospital
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 652 | $ 1,980
Number of hospitals purchased | Hospital |  | 2
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 38 | $ 473
Pretax gain (loss) before tax | 25 | 402
Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 614 | 647
GEORGIA, REPUBLIC OF | Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business |  | 860
Pretax gain (loss) before tax |  | $ 655
Number of hospitals sold | Hospital |  | 4
Southern Georgia [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisition [Line Items] |  |
Number of hospitals sold | Hospital |  | 2
Northern Georgia [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Business Acquisition [Line Items] |  |
Number of hospitals sold | Hospital |  | 2
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 176 | $ 91
Home Health and Hospice [Member] |  |
Business Acquisition [Line Items] |  |
Payment to acquire venture providing post acute care services |  | 330
Business acquisition percentage of voting interests acquired | 80.00% |
Hospital [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price |  | $ 67
Hospital [Member] | TENNESSEE |  |
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital |  | 1
Hospital [Member] | Southern Georgia [Member] |  |
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital |  | 1

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