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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, 2018 | Mar. 31, 2017
Accounting Policies [Abstract] |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 9,867 | $ 9,149
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 12.40% | 12.80%
Total uncompensated care | $ 6,252 | $ 5,327
Multiply by the cost-to-charges ratio | 12.40% | 12.80%
Estimated cost of total uncompensated care | $ 775 | $ 682

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