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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) State Hospital Surgery_Center Endoscopy_Center | Mar. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Number of owned and operated hospitals | Hospital | 186 |
Number of freestanding surgery centers | Surgery_Center | 121 |
Number of freestanding endoscopy centers | Endoscopy_Center | 21 |
Number of facilities locations | State | 20 |
General and administrative expense | $ 87 | $ 96
Performance obligations for inpatient/ outpatient services satisfied period | Our performance obligations for outpatient services are generally satisfied over a period of less than one day. |
Charity care amount | $ 2,942 | 3,735
Estimated costs of charity care | 335 | $ 444
Out of Network Services [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Revenues | $ 55 |
Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Percentage of income of federal poverty level eligible for charity care | 400.00% |

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