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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) Hospital	Sep. 30, 2024 USD ($) Hospital
Business Acquisition [Line Items]
Proceeds from sale of business	$ 177	$ 312
Pretax gain (loss) before tax	(4)	209
Real Estate and Other Investments [Member]
Business Acquisition [Line Items]
Proceeds from sale of business	22	17
Healthcare Entity [Member]
Business Acquisition [Line Items]
Aggregate purchase price	171	112
Hospital Facility [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 190	$ 112
Number of hospitals purchased | Hospital	2	3
Proceeds from sale of business	$ 155	$ 295
Number of hospitals sold | Hospital	1	1

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