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Significant Accounting Policies - Quality Incentive Premium Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Maximum available quality incentive premium - current period | $ 186 | $ 182 | $ 150
Amount of quality incentive premium revenue recognized in current period: |  |  |
Earned current period | 156 | 133 | 97
Earned prior periods | 38 | 31 | 10
Total quality incentive premium revenue recognized | $ 194 | $ 164 | $ 107
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.20% | 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

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- Definition Amount of quality incentive premium revenue recognized from prior year. + 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 In Current Period [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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X
- Definition Maximum available quality incentive premium current year. + References No definition available. + Details
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Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Quality Incentive Premium Revenue As A Percentage Of Total Revenue + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration