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Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Postemployment Benefits [Abstract]
Maximum matching contribution by employer under defined contribution plan	4.00%
Expense recognized in connection with contributions	$ 28	$ 28	$ 36
Deferred compensation plan deferral percentage of basic salary	75.00%
Deferred compensation plan deferral percentage of bonus	90.00%

X

- Definition

Deferred compensation plan deferral percentage of basic salary.

+ References

No definition available.

+ Details

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X

- Definition

Deferred compensation plan deferral percentage of bonus.

+ References

No definition available.

+ Details

Name:	moh_DeferredCompensationPlanDeferralPercentageOfBonus
Namespace Prefix:	moh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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X

- References

No definition available.

+ Details

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