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Basis of Presentation (Details)
member in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2016
USD ($)
Jun. 30, 2017
member
State
Jun. 30, 2017
USD ($)
member
State
Jun. 30, 2017
USD ($)
member
State
Segment
Mar. 31, 2017
USD ($)
Basis Of Presentation [Line Items]          
Number of reportable segments (in segment) | Segment       3  
Costs recognized     $ 43 $ 43  
Today's Options of New York, Inc. | New York          
Basis Of Presentation [Line Items]          
Final purchase price of business acquisition $ 38        
Health Plans          
Basis Of Presentation [Line Items]          
Number of states in which entity operates (in state) | State   12 12 12  
Number of members eligible for the health care programs, approximately (in member) | member   4.7 4.7 4.7  
Minimum contract terms       3 years  
Maximum contract terms       4 years  
Medicare Acquisition terminated          
Basis Of Presentation [Line Items]          
Gain recognized on contract termination         $ 75
Mississippi Coordinated Access Network          
Basis Of Presentation [Line Items]          
Services contract term   3 years      
Services contract renewal term   2 years