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Basis of Presentation (Details) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 19, 2018 USD ($)	Sep. 30, 2018 USD ($) member State	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) member State Segment	Sep. 30, 2017 USD ($)
Basis Of Presentation [Line Items]
Number of reportable segments (in segment) | Segment				3
Gain on sale of subsidiary		$ 37	$ 0	$ 37	$ 0
Health Plans
Basis Of Presentation [Line Items]
Number of states in which entity operates (in state) | State		13		13
Number of members eligible for the health care programs, approximately (in member) | member		4,000,000		4,000,000
Minimum contract terms				3 years
Maximum contract terms				5 years
New Mexico
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		206,000		206,000
Puerto Rico
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		320,000		320,000
Expected number of members served, approximately (in member) | member		290,000		290,000
Florida
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		96,000		96,000
Washington
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		738,000		738,000
Health Care, Premium | New Mexico | Health Plans
Basis Of Presentation [Line Items]
Revenue				$ 891
Health Care, Premium | Puerto Rico | Health Plans
Basis Of Presentation [Line Items]
Revenue				549
Health Care, Premium | Florida | Health Plans
Basis Of Presentation [Line Items]
Revenue				346
Health Care, Premium | Washington | Health Plans
Basis Of Presentation [Line Items]
Revenue				1,558
Molina Medicaid Solutions
Basis Of Presentation [Line Items]
Net cash selling price of equity interests		$ 233		$ 233
Scenario, Forecast | Pathways
Basis Of Presentation [Line Items]
Gain on sale of subsidiary	$ 40

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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