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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 | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expense and depreciation and amortization) | $ 16,196 | $ 15,077 | $ 47,300 | $ 44,617
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 10.00% | 10.30% | 9.70% | 10.20%
Total uncompensated care | $ 12,015 | $ 10,958 | $ 34,633 | $ 31,571
Multiply by the cost-to-charges ratio | 10.00% | 10.30% | 9.70% | 10.20%
Estimated cost of total uncompensated care | $ 1,188 | $ 1,138 | $ 3,359 | $ 3,220

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