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Other Noncurrent Liabilities and Redeemable/Noncontrolling Interests - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2016 USD ($) Hospital | Jun. 30, 2016 USD ($) Hospital | Sep. 30, 2017 USD ($) Facility
Minority Interest [Line Items] |  |  |
Behavioral health care facilities with outside owners holding non-controlling minority interest | Facility |  |  | 2
Non-controlling interest balances |  |  | $ 65
Redeemable non-controlling interest balances |  |  | $ 7
Acute Care Facilities | Washington, District of Columbia |  |  |
Minority Interest [Line Items] |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  |  | 20.00%
Acute Care Facilities | Texas |  |  |
Minority Interest [Line Items] |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  |  | 11.00%
Acute Care Facilities | Nevada |  |  |
Minority Interest [Line Items] |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  |  | 5.00%
Behavioral Health Services | Pennsylvania |  |  |
Minority Interest [Line Items] |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  |  | 20.00%
Behavioral Health Services | Ohio |  |  |
Minority Interest [Line Items] |  |  |
Percentage of non-controlling, minority ownership interests held by outside owners |  |  | 30.00%
Acute Care Hospital Services | Las Vegas, Nevada |  |  |
Minority Interest [Line Items] |  |  |
Number of hospital facilities | Hospital | 6 | 6 |
Payments to purchase minority ownership interests | $ 445 | $ 445 |
Purchase price of minority ownership interests | 418 | 418 |
Return of reserve capital to purchase of minority ownership interests | $ 27 | $ 27 |
Acute Care Hospital Services | Las Vegas, Nevada | Minimum |  |  |
Minority Interest [Line Items] |  |  |
Ownership interests purchased | 26.10% | 26.10% |
Acute Care Hospital Services | Las Vegas, Nevada | Maximum |  |  |
Minority Interest [Line Items] |  |  |
Ownership interests purchased | 27.50% | 27.50% |

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