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Medical Claims and Benefits Payable - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Insurance Claims [Line Items] |  |  |
Medical claims and benefits payable | $ 107 | $ 122 | $ 225
Prior period claims expense (benefit) recognized | 341 | $ (36) | $ 192
CMS Subsidies |  |  |
Insurance Claims [Line Items] |  |  |
Disposal group, operating expense | $ 81 |  |

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- Definition Insurance Claims [Line Items] + References No definition available. + Details
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Namespace Prefix: | moh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Medical Claims and Benefits Payable + References No definition available. + Details
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Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |