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Other Noncurrent Liabilities and Redeemable/Noncontrolling Interests - Additional Information (Detail)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Facility
Sep. 30, 2021
USD ($)
Minority Interest [Line Items]      
Behavioral health care facilities with outside owners holding non-controlling minority interest | Facility   7  
Non-controlling interest balances   $ 49  
Redeemable non-controlling interest balances   5  
Acquisition, cash paid   $ 19  
Nevada      
Minority Interest [Line Items]      
Acquisition, cash paid     $ 39
Washington, District of Columbia      
Minority Interest [Line Items]      
Acquisition, cash paid $ 51    
Outside Owners | Acute Care Facility | Texas      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   7.00%  
Outside Owners | Acute Care Facility | Nevada      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   5.00%  
Outside Owners | Behavioral Health Care Facility | Arizona      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   49.00%  
Outside Owners | Behavioral Health Care Facility | Pennsylvania      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   20.00%  
Outside Owners | Behavioral Health Care Facility | Ohio      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   30.00%  
Outside Owners | Behavioral Health Care Facility | Washington      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   20.00%  
Outside Owners | Behavioral Health Care Facility | Missouri      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   25.00%  
Outside Owners | Behavioral Health Care Facility | Iowa      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   48.00%  
Outside Owners | Behavioral Health Care Facility | Michigan      
Minority Interest [Line Items]      
Percentage of non-controlling, minority ownership interests held by outside owners   26.00%  
Hospital | Washington, District of Columbia      
Minority Interest [Line Items]      
Noncontrolling interest, ownership percentage by parent 20.00% 100.00%