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Accounting Policies - Schedule of Estimated Cost of Uncompensated Care (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 44,271 | $ 44,118 | $ 40,035
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 12.00% | 12.00% | 12.40%
Total uncompensated care | $ 29,029 | $ 31,105 | $ 26,757
Multiply by the cost-to-charges ratio | 12.00% | 12.00% | 12.40%
Estimated cost of total uncompensated care | $ 3,483 | $ 3,733 | $ 3,318

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