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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, 2022 | Mar. 31, 2021
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 12,744 | $ 11,643
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 11.30% | 11.40%
Total uncompensated care | $ 7,005 | $ 6,821
Multiply by the cost-to-charges ratio | 11.30% | 11.40%
Estimated cost of total uncompensated care | $ 792 | $ 778

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