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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 USD ($) Hospital Surgery_Center State | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Hospital Surgery_Center State | Jun. 30, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of owned and operated hospitals | Hospital | 184 |  | 184 |
Number of freestanding surgery centers | Surgery_Center | 125 |  | 125 |
Number of facilities locations | State | 21 |  | 21 |
General and administrative expense | $ 94 | $ 83 | $ 180 | $ 164
Percentage of sum of revenues and uncompensated care | 37.90% | 36.00% | 37.00% | 35.70%
Charity care amount | $ 3,311 | $ 1,977 | $ 6,216 | $ 3,856
Estimated costs of charity care | $ 403 | $ 249 | $ 746 | $ 482
Inpatient Services [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Performance obligations for inpatient/ outpatient services satisfied period |  |  | Our performance obligations for inpatient services are generally satisfied over periods that average approximately five days |
Out of Network Services [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenues |  |  | $ 86 |
Maximum [Member] | Outpatient Services [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
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 |

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