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Organization and Basis of Presentation (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 19, 2018 USD ($) | Dec. 31, 2018 USD ($) member State medical_member | Sep. 30, 2018 USD ($) member | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) member State medical_member | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Loss on sales of subsidiaries, net of gain |  | $ (52) | $ 37 | $ 0 | $ 0 | $ (15) | $ 0 | $ 0
Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of States in which company operates (in state) | State |  | 14 |  |  |  | 14 |  |
Number of members eligible for the health care programs | member |  | 3,800,000 |  |  |  | 3,800,000 |  |
Minimum contract terms |  |  |  |  |  | 3 years |  |
Maximum contract terms |  |  |  |  |  | 5 years |  |
Mississippi |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Expected number of members | member |  | 26,000 |  |  |  | 26,000 |  |
New Mexico |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 196,000 |  |  |  | 196,000 |  |
Puerto Rico |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 252,000 | 320,000 |  |  | 252,000 |  |
Medical care costs | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | $ 17,612 | 18,854 | 16,445
Medical care costs | New Mexico | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | 1,356 | 1,368 | 1,305
Medical care costs | Puerto Rico | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | 696 | 732 | 726
Medical care costs | Florida | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | $ 1,790 | 2,568 | 1,938
Medical care costs | Miami Dade and Monroe Counties | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | medical_member |  | 98,000 |  |  |  | 98,000 |  |
Premium revenue |  |  |  |  |  | $ 462 |  |
Medical care costs | Washington | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | 2,361 | $ 2,608 | $ 2,222
Molina Medicaid Solutions |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Net cash selling price of equity interests |  | $ 233 |  |  |  | 233 |  |
Loss on sales of subsidiaries, net of gain |  |  |  |  |  | 37 |  |
Gain (loss) on disposition of business, net of tax |  |  |  |  |  | $ 28 |  |
Pathways Health and Community Support LLC |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Loss on sales of subsidiaries, net of gain | $ 52 |  |  |  |  |  |  |
Gain (loss) on disposition of business, net of tax | $ (32) |  |  |  |  |  |  |
Medicaid | Washington |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 751,000 |  |  |  | 751,000 |  |
Medicaid | Medical care costs | New Mexico | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | $ 1,181 |  |
Medicaid | Medical care costs | Florida | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 272,000 |  |  |  | 272,000 |  |
Premium revenue |  |  |  |  |  | $ 1,479 |  |
Medicaid | Medical care costs | Washington | Health Plans |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | $ 2,035 |  |

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