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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total revenue | $ 4,646 | $ 4,904
Operating Segments | Health Plans |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 4,509 | 4,771
Operating Segments | Molina Medicaid Solutions |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 51 | 46
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 86 | $ 87

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