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Dispositions and Acquisitions - Additional Information (Detail)
$ in Millions
1 Months Ended 9 Months Ended
Nov. 08, 2021
Clinician
AmbulatorySurgeryCenter
Sep. 30, 2021
USD ($)
Bed
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]      
Aggregate cash proceeds from divestiture of businesses   $ 21 $ 8
CALIFORNIA | RMCPS      
Business Acquisition [Line Items]      
Number Of ambulatory surgery centers planning to acquire | AmbulatorySurgeryCenter 2    
CALIFORNIA | RMCPS | Minimum      
Business Acquisition [Line Items]      
Number Of clinicians | Clinician 170    
Nevada      
Business Acquisition [Line Items]      
Acquisition, cash paid   $ 39  
Number of beds available in micro-hospital | Bed   22  
Nevada | Real Estate and Other Assets      
Business Acquisition [Line Items]      
Acquisition, cash paid     $ 52