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Business Combinations (Details)
member in Thousands, $ in Millions
9 Months Ended
Aug. 01, 2016
USD ($)
member
Mar. 01, 2016
USD ($)
member
Jan. 01, 2016
USD ($)
member
Sep. 30, 2016
USD ($)
member
Business Acquisition [Line Items]        
Goodwill acquired during period | $       $ 95
Pathways        
Business Acquisition [Line Items]        
Pre-acquisition contingent liability and corresponding indemnification asset | $       $ 14
Percentage of goodwill expected to be deductible for income tax purposes       50.00%
Illinois        
Business Acquisition [Line Items]        
Number of members served, approximately (in member) | member       195
Illinois | Accountable Care Chicago, LLC        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $     $ 30  
Illinois | Accountable Care Chicago, LLC | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member     50  
Illinois | Loyola Physician Partners, LLC        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $     $ 12  
Illinois | Loyola Physician Partners, LLC | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member     18  
Illinois | Better Health Network, LLC        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $   $ 15    
Illinois | Better Health Network, LLC | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member   28    
Michigan | HAP Midwest Health Plan, Inc.        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $     $ 31  
Number of members served, approximately (in member) | member     68  
New York | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member 37      
New York | Today's Options of New York, Inc.        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $ $ 38      
New York | Today's Options of New York, Inc. | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member 37      
Washington | Columbia United Providers, Inc.        
Business Acquisition [Line Items]        
Final purchase price of business acquisition | $     $ 28  
Washington | Columbia United Providers, Inc. | Medicaid        
Business Acquisition [Line Items]        
Number of members added, approximately (in member) | member     57