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Organization and Basis of Presentation (Details)
member in Millions
 3 Months Ended
Mar. 31, 2019
member
State
Segment
Basis Of Presentation [Line Items]  
Number of reportable segments (in segment) | Segment 2
Health Plans  
Basis Of Presentation [Line Items]  
Number of states in which entity operates (in state) | State 14
Number of members eligible for the health care programs, approximately (in member) | member 3.4
Minimum contract terms 3 years
Maximum contract terms 5 years