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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Nov. 30, 2017 | Sep. 30, 2018 USD ($) State Hospital Surgery_Center | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) State Hospital Surgery_Center | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of owned and operated hospitals | Hospital |  |  | 179 |  | 179 |  |
Number of freestanding surgery centers | Surgery_Center |  |  | 122 |  | 122 |  |
Number of facilities locations | State |  |  | 20 |  | 20 |  |
General and administrative expense |  |  | $ 90 | $ 83 | $ 254 | $ 247 |
Estimated implicit price concessions recorded as reductions to revenues and accounts receivable |  |  |  |  | $ 5,781 |  | $ 5,488
Percentage of sum of revenues and uncompensated care |  |  | 37.20% | 36.30% | 36.20% | 34.80% |
Charity care amount |  |  | $ 2,314 | $ 1,235 | $ 6,170 | $ 3,494 |
Estimated costs of charity care |  |  | $ 295 | $ 167 | $ 777 | $ 458 |
Inpatient Services [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Performance obligations for inpatient/ outpatient services satisfied period |  |  | 5 days |  | 5 days |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of income of federal poverty level eligible for charity care | 200.00% | 400.00% |  |  |  |  |
Maximum [Member] | Outpatient Services [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Performance obligations for inpatient/ outpatient services satisfied period |  |  | 1 day |  | 1 day |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of income of federal poverty level eligible for charity care |  | 200.00% |  |  |  |  |

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