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Commitments and Contingencies (Details)
member in Thousands, $ in Millions
3 Months Ended
Oct. 01, 2015
plaintiff
Mar. 31, 2017
USD ($)
member
Mar. 31, 2016
USD ($)
Apr. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Entity Information [Line Items]            
Net assets of subsidiaries subject to restrictions   $ 1,527     $ 1,492  
Aggregate statutory capital and surplus   1,722        
Required minimum statutory capital surplus   1,100        
Premium stabilization program, risk corridor, prior years   52        
Premium stabilization program, risk corridor, current year   90        
Premium revenue   4,648 $ 3,995      
Receivables   $ 1,006     974  
Illinois            
Entity Information [Line Items]            
Number of members served, approximately | member   194        
Puerto Rico            
Entity Information [Line Items]            
Number of members served, approximately | member   326        
Premium revenue   $ 183        
Health Plans | Illinois            
Entity Information [Line Items]            
Premium revenue   161        
Health Plans | Illinois | Subsequent Event            
Entity Information [Line Items]            
Receivables       $ 80    
Parent Company            
Entity Information [Line Items]            
Restricted cash and investments   $ 273     $ 264  
The Rodriquez Litigation            
Entity Information [Line Items]            
Number of plaintiffs | plaintiff 7          
Pathways Health and Community Support LLC            
Entity Information [Line Items]            
Liabilities arising from contingencies, amount recognized           $ 14
Executives | Deferred Termination Fee            
Entity Information [Line Items]            
Deferred compensation arrangement, cash awards granted, percentage of base salary   400.00%        
CEO | Deferred Bonus            
Entity Information [Line Items]            
Deferred compensation arrangement, cash awards granted, percentage of base salary   150.00%        
CFO | Deferred Bonus            
Entity Information [Line Items]            
Deferred compensation arrangement, cash awards granted, percentage of base salary   125.00%