Acquisitions and Dispositions - Additional Information (Detail) $ in Millions		9 Months Ended
Oct. 01, 2024 Hospital	Sep. 30, 2024 USD ($) Hospital	Sep. 30, 2023 USD ($) Hospital
Business Acquisition [Line Items]
Proceeds from sale of business		$ 312	$ 183
Pretax gain (loss) before tax		209	12
Real Estate and Other Investments [Member]
Business Acquisition [Line Items]
Proceeds from sale of business		17	21
Nonhospital Health Care [Member]
Business Acquisition [Line Items]
Aggregate purchase price		112	198
Hospital Facility [Member]
Business Acquisition [Line Items]
Aggregate purchase price		$ 112	$ 83
Number of hospitals purchased \| Hospital		3	1
Proceeds from sale of business		$ 295	$ 162
Number of hospitals sold \| Hospital		1	2
Hospital Facility [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Number of hospitals purchased \| Hospital	1
Effective date of acquired hospital facility	Oct. 01, 2024

Number of hospitals acquired.

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Number of hospitals sold.

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- Definition

Date when the acquirer obtains control of the acquiree, in YYYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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