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Business Combinations - Narrative (Details)
member in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Jul. 01, 2020
USD ($)
member
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
business_combination
Sep. 01, 2020
member
Business Acquisition, Contingent Consideration [Line Items]        
Number of business combinations | business_combination     2  
Contingent consideration liabilities   $ 40 $ 40  
Your care health plan inc        
Business Acquisition, Contingent Consideration [Line Items]        
Purchase price of the assets $ 42      
Number of members eligible for the health care programs, approximately | member 47      
Goodwill $ 31      
Passport health plan inc        
Business Acquisition, Contingent Consideration [Line Items]        
Purchase price of the assets   20    
Number of members eligible for the health care programs, approximately | member       325
Goodwill   27 27  
Total Purchase price   60    
Contingent consideration liabilities   $ 40 $ 40