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Significant Accounting Policies - Segment reporting (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Molina Medicaid Solutions |  |
Segment Reporting Information [Line Items] |  |
Receivables: | $ 41 | $ 30
Deferred contract costs (contract assets) – Molina Medicaid Solutions | 103 | 101
Deferred revenue (contract liabilities) – Molina Medicaid Solutions | 41 | 49
Other segment |  |
Segment Reporting Information [Line Items] |  |
Receivables: | $ 46 | $ 44

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