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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 11,170 | $ 11,060 | $ 32,428 | $ 32,619
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 12.00% | 12.30% | 12.10% | 12.10%
Total uncompensated care | $ 7,023 | $ 7,923 | $ 21,625 | $ 22,703
Multiply by the cost-to-charges ratio | 12.00% | 12.30% | 12.10% | 12.10%
Estimated cost of total uncompensated care | $ 843 | $ 975 | $ 2,617 | $ 2,747

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