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Organization and Basis of Presentation (Details)
member in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 15 Months Ended
Oct. 29, 2019
member
Sep. 30, 2019
USD ($)
state
member
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
state
member
Sep. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
country
member
Segment Reporting Information [Line Items]            
Number of reportable segments (in segment) | segment       2    
Premium revenue | $   $ 4,084 $ 4,337 $ 12,085 $ 13,174  
Texas Health and Human Services Commission, STARPLUS Program            
Segment Reporting Information [Line Items]            
Premium revenue | $       $ 1,200    
Subsequent Event | YourCare Health Plan | Forecast            
Segment Reporting Information [Line Items]            
Number of members eligible for the health care programs, approximately (in member) | member           46
Number of countries | country           7
Purchase price of assets | $           $ 40
Subsequent Event | Texas Health and Human Services Commission, STARPLUS Program            
Segment Reporting Information [Line Items]            
Number of members eligible for the health care programs, approximately (in member) | member 86          
Contract term 3 years          
Health Plans            
Segment Reporting Information [Line Items]            
Number of states in which entity operates (in state) | state   14   14    
Number of members eligible for the health care programs, approximately (in member) | member   3,300   3,300    
Minimum | Health Plans            
Segment Reporting Information [Line Items]            
Contract term       3 years    
Maximum | Health Plans            
Segment Reporting Information [Line Items]            
Contract term       5 years