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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expense and depreciation and amortization) | $ 13,561 | $ 12,524 | $ 26,718 | $ 25,268
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 10.50% | 11.00% | 10.50% | 11.20%
Total uncompensated care | $ 8,483 | $ 8,457 | $ 16,474 | $ 15,462
Multiply by the cost-to-charges ratio | 10.50% | 11.00% | 10.50% | 11.20%
Estimated cost of total uncompensated care | $ 899 | $ 940 | $ 1,730 | $ 1,732

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