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Goodwill and Intangible Assets, Net - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) medical_member | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) medical_member | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | $ 18,854,000,000 | $ 16,445,000,000 | $ 13,261,000,000
Goodwill impairment charges |  |  |  | 434,000,000 | 0 |
Future Amortization Expenses |  |  |  |  |  |
Future amortization expense, 2018 | $ 21,000,000 |  |  | 21,000,000 |  |
Future amortization expense, 2019 | 18,000,000 |  |  | 18,000,000 |  |
Future amortization expense, 2020 | 14,000,000 |  |  | 14,000,000 |  |
Future amortization expense, 2021 | 5,000,000 |  |  | 5,000,000 |  |
Future amortization expense, 2022 | 3,000,000 |  |  | 3,000,000 |  |
Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | 18,854,000,000 | 16,445,000,000 | 13,261,000,000
Goodwill impairment charges |  |  |  | 244,000,000 |  |
Molina Medicaid Solutions |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment charges |  |  |  | 28,000,000 |  |
Other |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment charges |  |  |  | $ 162,000,000 |  |
Impairment of intangible assets |  |  | $ 11,000,000 |  |  |
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  |  | 15 years |  |
Subsidiaries | Molina Medicaid Solutions |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment charges |  | $ 28,000,000 |  |  |  |
PCC | Subsidiaries |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment charges |  | $ 101,000,000 | 59,000,000 |  |  |
Other Subsidiary | Subsidiaries |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment charges |  |  | $ 2,000,000 |  |  |
Florida | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | $ 2,568,000,000 | 1,938,000,000 | 1,199,000,000
Florida | Contract rights and licenses | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of intangible assets | $ 15,000,000 |  |  |  |  |
Miami Dade and Monroe Counties | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | medical_member | 59,000 |  |  | 59,000 |  |
New Mexico | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | $ 1,368,000,000 | 1,305,000,000 | 1,237,000,000
New Mexico | Contract rights and licenses | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of intangible assets | $ 10,000,000 |  |  |  |  |
Illinois | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | 593,000,000 | 603,000,000 | 398,000,000
Goodwill impairment charges | 45,000,000 |  |  |  |  |
New York | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | $ 181,000,000 | $ 82,000,000 | $ 0
Goodwill impairment charges | $ 1,000,000 |  |  |  |  |
Medicaid | Florida | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | medical_member | 360,000 |  |  | 360,000 |  |
Premium revenue |  |  |  | $ 1,486,000,000 |  |
Goodwill impairment charges | $ 124,000,000 |  |  |  |  |
Medicaid | New Mexico | Health Plans |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | medical_member | 224,000 |  |  | 224,000 |  |
Premium revenue |  |  |  | $ 1,205,000,000 |  |
Goodwill impairment charges | $ 74,000,000 |  |  |  |  |

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