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Accounting Policies - Schedule of Estimated Cost of Uncompensated Care (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounting Policies [Abstract] |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 55,341 | $ 51,180 | $ 49,074
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 10.50% | 11.00% | 11.30%
Total uncompensated care | $ 35,426 | $ 31,734 | $ 29,642
Multiply by the cost-to-charges ratio | 10.50% | 11.00% | 11.30%
Estimated cost of total uncompensated care | $ 3,720 | $ 3,491 | $ 3,350

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