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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Proceeds from sale of business	$ 30	$ 39
Real Estate and Other Investments [Member]
Business Acquisition [Line Items]
Pretax gain (loss) before tax	10	(20)
Proceeds from sale of business	30	39
Hospital and other nonhospital health care entities [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 98	$ 346

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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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No definition available.

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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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- Definition

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

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-Publisher FASB
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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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