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Basis of Presentation and Significant Accounting Policies - Schedule of Estimated Cost of Uncompensated Care (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 15,466 | $ 14,779
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 9.60% | 10.10%
Total uncompensated care | $ 10,993 | $ 10,002
Multiply by the cost-to-charges ratio | 9.60% | 10.10%
Estimated cost of total uncompensated care | $ 1,055 | $ 1,010

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