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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%