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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Add: other operating revenues | $ 4,646 | $ 4,904
Less: other operating expenses | (4,424) | (4,822)
Operating income | 222 | 82
Other expenses (income), net | 43 | (49)
Income before income tax expense | 179 | 131
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gross margin | 615 | 546
Operating Segments | Health Plans |  |
Segment Reporting Information [Line Items] |  |
Gross margin | 601 | 537
Add: other operating revenues | 4,509 | 4,771
Operating Segments | Molina Medicaid Solutions |  |
Segment Reporting Information [Line Items] |  |
Gross margin | 8 | 4
Add: other operating revenues | 51 | 46
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Gross margin | 6 | 5
Add: other operating revenues | 86 | 87
Other operating |  |
Segment Reporting Information [Line Items] |  |
Add: other operating revenues | 189 | 125
Less: other operating expenses | $ (582) | $ (589)

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