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Medical Claims and Benefits Payable (Details)
member in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Aug. 01, 2016
member
Sep. 30, 2016
USD ($)
member
Dec. 31, 2015
USD ($)
Insurance Claims [Line Items]      
Non-risk provider payables | $   $ 237 $ 167
Favorable prior period claims development | $   $ 190 $ 141
New York | Medicaid      
Insurance Claims [Line Items]      
Number of members added, approximately (in member) 37    
Washington | Fully Integrated Managed Care      
Insurance Claims [Line Items]      
Number of members added, approximately (in member)   85  
California | Medicaid Expansion      
Insurance Claims [Line Items]      
Number of members added, approximately (in member)   55