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Segment Information - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total gross margin	$ 446	$ 564	$ 254	$ 546	$ 354	$ 471	$ 466	$ 434	$ 1,810	$ 1,725	$ 1,527
Other operating revenues	$ 4,949	$ 5,031	$ 4,999	$ 4,904	$ 4,534	$ 4,546	$ 4,359	$ 4,343	19,883	17,782	14,178
Other operating expenses									(20,438)	(17,476)	(13,791)
Operating income									(555)	306	387
Other expenses, net									57	101	65
(Loss) income before income tax (benefit) expense									(612)	205	322
Health Plans
Segment Reporting Information [Line Items]
Total gross margin									1,781	1,671	1,467
Other operating revenues									19,352	17,234	13,917
Molina Medicaid Solutions
Segment Reporting Information [Line Items]
Total gross margin									16	21	55
Other operating revenues									187	195	195
Other
Segment Reporting Information [Line Items]
Total gross margin									13	33	5
Other operating revenues									344	353	66
Operating Segments
Segment Reporting Information [Line Items]
Total gross margin									1,810	1,725	1,527
Operating Segments | Health Plans
Segment Reporting Information [Line Items]
Total gross margin									1,781	1,671	1,467
Operating Segments | Molina Medicaid Solutions
Segment Reporting Information [Line Items]
Total gross margin									16	21	55
Operating Segments | Other
Segment Reporting Information [Line Items]
Total gross margin									13	33	5
Other Operating
Segment Reporting Information [Line Items]
Other operating revenues									508	798	664
Other operating expenses									$ (2,873)	$ (2,217)	$ (1,804)

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Total costs of sales and operating expenses for the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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