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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, 2019 USD ($) Hospital Surgery_Center State | Mar. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Number of owned and operated hospitals | Hospital | 185 |
Number of freestanding surgery centers | Surgery_Center | 124 |
Number of facilities locations | State | 21 |
General and administrative expense | $ 86 | $ 81
Percentage of sum of revenues and uncompensated care | 36.10% | 35.40%
Charity care amount | $ 2,905 | $ 1,879
Estimated costs of charity care | $ 343 | $ 233
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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