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Basis of Presentation (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 19, 2018 USD ($) | Sep. 30, 2018 USD ($) member State | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) member State Segment | Sep. 30, 2017 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |
Number of reportable segments (in segment) | Segment |  |  |  | 3 |
Gain on sale of subsidiary |  | $ 37 | $ 0 | $ 37 | $ 0
Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of states in which entity operates (in state) | State |  | 13 |  | 13 |
Number of members eligible for the health care programs, approximately (in member) | member |  | 4,000,000 |  | 4,000,000 |
Minimum contract terms |  |  |  | 3 years |
Maximum contract terms |  |  |  | 5 years |
New Mexico |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of members served, approximately (in member) | member |  | 206,000 |  | 206,000 |
Puerto Rico |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of members served, approximately (in member) | member |  | 320,000 |  | 320,000 |
Expected number of members served, approximately (in member) | member |  | 290,000 |  | 290,000 |
Florida |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of members served, approximately (in member) | member |  | 96,000 |  | 96,000 |
Washington |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of members served, approximately (in member) | member |  | 738,000 |  | 738,000 |
Health Care, Premium | New Mexico | Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Revenue |  |  |  | $ 891 |
Health Care, Premium | Puerto Rico | Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Revenue |  |  |  | 549 |
Health Care, Premium | Florida | Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Revenue |  |  |  | 346 |
Health Care, Premium | Washington | Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Revenue |  |  |  | 1,558 |
Molina Medicaid Solutions |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Net cash selling price of equity interests |  | $ 233 |  | $ 233 |
Scenario, Forecast | Pathways |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Gain on sale of subsidiary | $ 40 |  |  |  |

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