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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, 2021 | Mar. 31, 2020
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 11,643 | $ 11,342
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 11.40% | 11.90%
Total uncompensated care | $ 6,821 | $ 7,873
Multiply by the cost-to-charges ratio | 11.40% | 11.90%
Estimated cost of total uncompensated care | $ 778 | $ 937

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