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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

X

- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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