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Significant Accounting Policies - Segment reporting (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Molina Medicaid Solutions
Segment Reporting Information [Line Items]
Receivables:	$ 34	$ 30
Deferred contract costs (contract assets) – Molina Medicaid Solutions	109	101
Deferred revenue (contract liabilities) – Molina Medicaid Solutions	39	49
Other segment
Segment Reporting Information [Line Items]
Receivables:	$ 40	$ 44

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