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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expense and depreciation and amortization) | $ 15,077 | $ 14,121 | $ 44,617 | $ 40,839
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 10.30% | 10.90% | 10.20% | 10.60%
Total uncompensated care | $ 10,958 | $ 9,042 | $ 31,571 | $ 25,516
Multiply by the cost-to-charges ratio | 10.30% | 10.90% | 10.20% | 10.60%
Estimated cost of total uncompensated care | $ 1,138 | $ 975 | $ 3,220 | $ 2,705

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