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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 12,524 | $ 11,950 | $ 25,268 | $ 23,593
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 11.00% | 11.10% | 11.20% | 11.20%
Total uncompensated care | $ 8,457 | $ 7,696 | $ 15,462 | $ 14,517
Multiply by the cost-to-charges ratio | 11.00% | 11.10% | 11.20% | 11.20%
Estimated cost of total uncompensated care | $ 940 | $ 848 | $ 1,732 | $ 1,626

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