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Segments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Segment | Sep. 30, 2017 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Number of reportable segments (in segment) | Segment |  |  | 3 |
Gain on sale of subsidiary | $ 37 | $ 0 | $ 37 | $ 0
Molina Medicaid Solutions |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Net cash selling price of equity interests | $ 233 |  | $ 233 |

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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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