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Commitments and Contingencies (Details)
member in Thousands, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 01, 2015
plaintiff
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
member
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
member
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Entity Information [Line Items]              
Net assets of subsidiaries subject to restrictions     $ 1,696   $ 1,696   $ 1,492
Aggregate statutory capital and surplus     1,828   1,828    
Required minimum statutory capital surplus     1,113   1,113    
Premium stabilization program, risk corridor, prior years     52   52    
Premium stabilization program, risk corridor, current year     76   76    
Premium revenue     4,777 $ 4,191 14,165 $ 12,215  
Receivables     $ 1,002   $ 1,002   974
Illinois              
Entity Information [Line Items]              
Number of members served, approximately (in member) | member     163   163    
Puerto Rico              
Entity Information [Line Items]              
Number of members served, approximately (in member) | member     306   306    
Health Plans | Illinois              
Entity Information [Line Items]              
Premium revenue         $ 447    
Receivables     $ 220   220    
Health Plans | Puerto Rico              
Entity Information [Line Items]              
Premium revenue         553    
The Rodriquez Litigation              
Entity Information [Line Items]              
Number of plaintiffs (in plaintiff) | plaintiff 7            
Rutherford County, Tennessee              
Entity Information [Line Items]              
Liabilities arising from contingencies, amount recognized   $ 3          
Pathways Health and Community Support LLC              
Entity Information [Line Items]              
Liabilities arising from contingencies, amount recognized   $ 14   $ 14   $ 14  
Parent Company              
Entity Information [Line Items]              
Restricted investments     $ 391   $ 391   $ 264