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Organization and Basis of Presentation (Details) $ in Millions		3 Months Ended				12 Months Ended
	Oct. 19, 2018 USD ($)	Dec. 31, 2018 USD ($) member State medical_member	Sep. 30, 2018 USD ($) member	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) member State medical_member	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Basis Of Presentation [Line Items]
Loss on sales of subsidiaries, net of gain		$ (52)	$ 37	$ 0	$ 0	$ (15)	$ 0	$ 0
Health Plans
Basis Of Presentation [Line Items]
Number of States in which company operates (in state) | State		14				14
Number of members eligible for the health care programs | member		3,800,000				3,800,000
Minimum contract terms						3 years
Maximum contract terms						5 years
Mississippi
Basis Of Presentation [Line Items]
Expected number of members | member		26,000				26,000
New Mexico
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		196,000				196,000
Puerto Rico
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		252,000	320,000			252,000
Medical care costs | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						$ 17,612	18,854	16,445
Medical care costs | New Mexico | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						1,356	1,368	1,305
Medical care costs | Puerto Rico | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						696	732	726
Medical care costs | Florida | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						$ 1,790	2,568	1,938
Medical care costs | Miami Dade and Monroe Counties | Health Plans
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | medical_member		98,000				98,000
Premium revenue						$ 462
Medical care costs | Washington | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						2,361	$ 2,608	$ 2,222
Molina Medicaid Solutions
Basis Of Presentation [Line Items]
Net cash selling price of equity interests		$ 233				233
Loss on sales of subsidiaries, net of gain						37
Gain (loss) on disposition of business, net of tax						$ 28
Pathways Health and Community Support LLC
Basis Of Presentation [Line Items]
Loss on sales of subsidiaries, net of gain	$ 52
Gain (loss) on disposition of business, net of tax	$ (32)
Medicaid | Washington
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		751,000				751,000
Medicaid | Medical care costs | New Mexico | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						$ 1,181
Medicaid | Medical care costs | Florida | Health Plans
Basis Of Presentation [Line Items]
Number of members served, approximately (in member) | member		272,000				272,000
Premium revenue						$ 1,479
Medicaid | Medical care costs | Washington | Health Plans
Basis Of Presentation [Line Items]
Premium revenue						$ 2,035

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