XML 106 R61.htm IDEA: XBRL DOCUMENT v3.8.0.1

Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	$ 3,215	$ 2,025
Total liabilities measured at fair value on a recurring basis	522	267
Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	101
U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	68
Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	169
Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	1,588	1,179
U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	388	84
Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	253	231
Municipal securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	141	142
Asset-backed securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	117	69
Certificates of deposit
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	37	53
Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	2,524	1,758
1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	522	267
1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	522	267
Level 1
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	709	315
Total liabilities measured at fair value on a recurring basis	0	0
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0
Level 1 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	68
Level 1 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	68
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 1 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	388	84
Level 1 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	253	231
Level 1 | Municipal securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 1 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 1 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 1 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	641	315
Level 1 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 1 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	0	0
Level 2
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	1,984	1,443
Total liabilities measured at fair value on a recurring basis	0	0
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	101
Level 2 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0
Level 2 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	101
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	1,588	1,179
Level 2 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 2 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	141	142
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	117	69
Level 2 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	37	53
Level 2 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	1,883	1,443
Level 2 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 2 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	0	0
Level 3
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	522	267
Total liabilities measured at fair value on a recurring basis	522	267
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0
Level 3 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0
Level 3 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | U.S. treasury notes
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | Municipal securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	0	0
Level 3 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets measured at fair value on a recurring basis	522	267
Level 3 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	$ 522	$ 267

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=moh_RestrictedInvestmentsCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryNotesSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=moh_MunicipalSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=moh_CurrentInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: