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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 | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 10,953 | $ 9,871 | $ 21,559 | $ 19,738
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 12.20% | 12.60% | 12.00% | 12.50%
Total uncompensated care | $ 7,695 | $ 6,486 | $ 14,780 | $ 12,738
Multiply by the cost-to-charges ratio | 12.20% | 12.60% | 12.00% | 12.50%
Estimated cost of total uncompensated care | $ 938 | $ 817 | $ 1,774 | $ 1,592

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