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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, 2020 | Mar. 31, 2019
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 11,342 | $ 10,606
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 11.90% | 11.80%
Total uncompensated care | $ 7,873 | $ 7,085
Multiply by the cost-to-charges ratio | 11.90% | 11.80%
Estimated cost of total uncompensated care | $ 937 | $ 836

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