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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 | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 9,946 | $ 9,472 | $ 29,684 | $ 27,798
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 12.70% | 13.40% | 12.60% | 13.10%
Total uncompensated care | $ 6,786 | $ 6,089 | $ 19,524 | $ 17,137
Multiply by the cost-to-charges ratio | 12.70% | 13.40% | 12.60% | 13.10%
Estimated cost of total uncompensated care | $ 862 | $ 816 | $ 2,460 | $ 2,245

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