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Medical Claims and Benefits Payable - Additional Information (Details)
member in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
member
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Other Liabilities Disclosure [Abstract]      
Non-risk provider payables $ 111   $ 225
Reinsurance recoverables 65   $ 83
Liability for Claims and Claims Adjustment Expense [Line Items]      
Expense (recovery) for prior period claims development $ (31) $ (189)  
Number of members added, approximately | member 0.4    
Minimum      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Percentage of IBNP not expected to be paid 8.00%    
Maximum      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Percentage of IBNP not expected to be paid 10.00%