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v3.21.2

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Endoscopy_Center Surgery_Center State Hospital | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Endoscopy_Center Surgery_Center State Hospital | Sep. 30, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of owned and operated hospitals | Hospital | 183 |  | 183 |
Number of freestanding surgery centers | Surgery_Center | 123 |  | 123 |
Number of freestanding endoscopy centers | Endoscopy_Center | 21 |  | 21 |
Number of facilities locations | State | 20 |  | 20 |
General and administrative expense | $ 87 | $ 117 | $ 301 | $ 289
Performance obligations for inpatient/ outpatient services satisfied period |  |  | Our performance obligations for inpatient services are generally satisfied over periodsthat average approximately five days, and revenues are recognized based on charges incurred in relation to total expected charges. Our performance obligations for outpatient services are generally satisfied over a period of less than one day. |
Charity care amount | 3,509 | 3,160 | $ 10,135 | 9,972
Estimated costs of charity care | $ 413 | $ 376 | 1,155 | 1,207
Out of Network Services [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenues |  |  | $ 33 | $ 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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