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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
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Mar. 31, 2023 | Mar. 31, 2022
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 13,157 | $ 12,744
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 10.40% | 11.30%
Total uncompensated care | $ 7,991 | $ 7,005
Multiply by the cost-to-charges ratio | 10.40% | 11.30%
Estimated cost of total uncompensated care | $ 831 | $ 792

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