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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 |  |  |

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