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Cover Page - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-31719    
Entity Registrant Name MOLINA HEALTHCARE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-4204626    
Entity Address, Address Line One 200 Oceangate    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Long Beach    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90802    
City Area Code 562    
Local Phone Number 435-3666    
Title of 12(b) Security Common Stock, $0.001 Par Value    
Trading Symbol MOH    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 8,928.7
Entity Common Stock, Shares Outstanding   60,800  
Documents Incorporated by Reference
Portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Stockholders to be held on May 7, 2020, are incorporated by reference into Part III of this Form 10-K, to the extent described therein.
    
Entity Central Index Key 0001179929    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31