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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Other Liabilities Disclosure [Abstract] |  |  |  |
Fee-for-service claims incurred but not paid (“IBNP”) | $ 1,411 | $ 1,562 |  |
Pharmacy payable | 114 | 115 |  |
Capitation payable | 59 | 52 |  |
Other | 411 | 232 |  |
Medical claims and benefits payable | $ 1,995 | $ 1,961 | $ 2,023 | $ 2,192

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- Definition Capitation Claims 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 Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Paid (IBNP), Fee-for-service Claims, Amount + References No definition available. + Details
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Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Other Claims 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 Pharmacy Claims Payable + References No definition available. + Details
Name: | moh_PharmacyClaimsPayable
Namespace Prefix: | moh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration