Acquisitions and Dispositions - Additional Information (Detail) $ in Millions	9 Months Ended
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

Number of hospitals acquired.

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Number of hospitals sold.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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The cash outflow associated with a second acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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