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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Add: other operating revenues	$ 4,883	$ 4,999	$ 9,529	$ 9,903
Less: other operating expenses	(4,541)	(5,286)	(8,965)	(10,108)
Operating income (loss)	342	(287)	564	(205)
Other expenses (income), net	37	27	80	(22)
Income (loss) before income tax expense (benefit)	305	(314)	484	(183)
Health Plans
Segment Reporting Information [Line Items]
Add: other operating revenues	4,752	4,868	9,261	9,639
Molina Medicaid Solutions
Segment Reporting Information [Line Items]
Add: other operating revenues	48	47	99	93
Other
Segment Reporting Information [Line Items]
Add: other operating revenues	83	84	169	171
Operating Segments
Segment Reporting Information [Line Items]
Gross margin	673	254	1,288	800
Operating Segments | Health Plans
Segment Reporting Information [Line Items]
Gross margin	664	249	1,265	786
Operating Segments | Molina Medicaid Solutions
Segment Reporting Information [Line Items]
Gross margin	4	4	12	8
Operating Segments | Other
Segment Reporting Information [Line Items]
Gross margin	5	1	11	6
Other operating
Segment Reporting Information [Line Items]
Add: other operating revenues	242	130	431	255
Less: other operating expenses	$ (573)	$ (671)	$ (1,155)	$ (1,260)

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