Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 23, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-31719
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 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 Common Stock, Shares Outstanding		58,400,000
Entity Central Index Key	0001179929
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false