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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accounting Policies [Abstract] |  |  |  |
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization) | $ 12,828 | $ 12,803 | $ 38,096 | $ 36,396
Cost-to-charges ratio (patient care costs as percentage of gross patient charges) | 11.20% | 11.80% | 11.20% | 11.40%
Total uncompensated care | $ 8,050 | $ 7,782 | $ 23,512 | $ 22,299
Multiply by the cost-to-charges ratio | 11.20% | 11.80% | 11.20% | 11.40%
Estimated cost of total uncompensated care | $ 901 | $ 916 | $ 2,633 | $ 2,542

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