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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 08, 2020 USD ($) | Sep. 30, 2020 USD ($) Hospital State Surgery_Center | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Hospital State Surgery_Center | Sep. 30, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of owned and operated hospitals | Hospital |  | 187 |  |  | 187 |
Number of freestanding surgery centers | Surgery_Center |  | 121 |  |  | 121 |
Number of facilities locations | State |  | 21 |  |  | 21 |
General and administrative expense |  | $ 117 |  | $ 88 | $ 289 | $ 268
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 |  | 3,160 |  | 3,425 | $ 9,972 | 9,641
Estimated costs of charity care |  | 376 |  | $ 421 | 1,207 | 1,167
Government stimulus income reversal |  | (822) |  |  | 0 |
CARES Act Provider Relief Fund [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Deferred social security taxes |  | 441 |  |  | 441 |
Employee retention payroll tax credits |  |  |  |  | 60 |
Accelerated Medicare payments received | $ 4,400 |  |  |  | 4,449 |
General and targeted distributions recived | $ 1,600 |  |  |  | 1,674 |
Government stimulus income reversal |  | $ 822 | $ (822) |  |  |
Out of Network Services [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenues |  |  |  |  | $ 55 | $ 86
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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