Relationship with Universal Health Realty Income Trust, Other Related Party Transactions and Other Investments - Additional Information 5 (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsMiscellaneousNoncurrent \| Healthcare Generative Artificial Intelligence Company
Related Party Transaction [Line Items]
Current market value of non-marketable securities	$ 115	$ 115

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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+ Details