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v3.20.1

Organization and Basis of Presentation (Details) member in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 member segment state
Segment Reporting Information [Line Items] |
Number of reportable segments (in segment) | segment | 2
Health Plans |
Segment Reporting Information [Line Items] |
Number of states in which entity operates (in state) | state | 14
Number of members eligible for the health care programs, approximately (in member) | member | 3.4
Minimum | Health Plans |
Segment Reporting Information [Line Items] |
Contract term | 3 years
Maximum | Health Plans |
Segment Reporting Information [Line Items] |
Contract term | 5 years

X
- Definition Contract Term + References No definition available. + Details
Name: | moh_ContractTerm
Namespace Prefix: | moh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of members eligible for the health care programs. + References No definition available. + Details
Name: | moh_NumberOfMembersEligibleForTheHealthCarePrograms
Namespace Prefix: | moh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=moh_HealthPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |