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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 | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expense and depreciation and amortization) | $ 15,638 | $ 14,761 | $ 31,104 | $ 29,540
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 9.70% | 10.10% | 9.60% | 10.10%
Total uncompensated care | $ 11,625 | $ 10,611 | $ 22,618 | $ 20,613
Multiply by the cost-to-charges ratio | 9.70% | 10.10% | 9.60% | 10.10%
Estimated cost of total uncompensated care | $ 1,116 | $ 1,072 | $ 2,171 | $ 2,082

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