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Significant Accounting Policies - Quality Incentive Premium Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |
Maximum available quality incentive premium - current period | $ 150 | $ 147 | $ 118
Amount of quality incentive premium revenue recognized in current period - Earned current period | 97 | 104 | 66
Amount of quality incentive premium revenue recognized in current period - Earned prior periods | 10 | 47 | 13
Total quality incentive premium revenue recognized | $ 107 | $ 151 | $ 79
Quality incentive premium revenue recognized as a percentage of total premium revenue | 0.60% | 0.90% | 0.60%

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- Definition Amount of current year quality incentive premium revenue recognized. + References No definition available. + Details
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Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of quality incentive premium revenue recognized from prior year. + References No definition available. + Details
Name: | moh_AmountOfQualityIncentivePremiumRevenueRecognizedFromPriorYear
Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum available quality incentive premium current year. + References No definition available. + Details
Name: | moh_MaximumAvailableQualityIncentivePremiumCurrentYear
Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Quality Incentive Premium Revenue As A Percentage Of Total Revenue + References No definition available. + Details
Name: | moh_QualityIncentivePremiumRevenueAsAPercentageOfTotalRevenue
Namespace Prefix: | moh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Quality incentive premium revenue recognized. + References No definition available. + Details
Name: | moh_QualityIncentivePremiumRevenueRecognized
Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration