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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |
Cash and cash equivalents | $ 3,392 | $ 2,979 | $ 3,392 | $ 2,979 | $ 3,186
Total assets held for sale | 230 |  | 230 |  | 0
Total liabilities | 66 |  | 66 |  | $ 0
Income Statement [Abstract] |  |  |  |  |
Total revenue | 4,883 | 4,999 | 9,529 | 9,903 |
Health Plans |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |
Total revenue | 4,752 | 4,868 | 9,261 | 9,639 |
Molina Medicaid Solutions |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |
Cash and cash equivalents | 9 |  | 9 |  |
Receivables and prepaid expenses | 41 |  | 41 |  |
Goodwill and property, equipment, and capitalized software, net | 70 |  | 70 |  |
Deferred contract costs and other assets | 110 |  | 110 |  |
Total assets held for sale | 230 |  | 230 |  |
Accounts payable and accrued and other liabilities | 27 |  | 27 |  |
Deferred revenue | 39 |  | 39 |  |
Total liabilities | 66 |  | 66 |  |
Income Statement [Abstract] |  |  |  |  |
Total revenue | 48 | 47 | 99 | 93 |
Other |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |
Total revenue | $ 83 | $ 84 | $ 169 | $ 171 |

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