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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Add: other operating revenues | $ 4,697 | $ 5,031 | $ 14,226 | $ 14,934
Add: gain on sale of subsidiary | 37 | 0 | 37 | 0
Total operating expenses | 4,439 | 5,112 | 13,404 | 15,220
Operating income (loss) | 295 | (81) | 859 | (286)
Other expenses, net | 36 | 32 | 116 | 10
Income (loss) before income tax expense (benefit) | 259 | (113) | 743 | (296)
Health Plans |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Add: other operating revenues | 4,565 | 4,899 | 13,826 | 14,538
Molina Medicaid Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Add: other operating revenues | 53 | 47 | 152 | 140
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Add: other operating revenues | 79 | 85 | 248 | 256
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 566 | 564 | 1,854 | 1,364
Operating Segments | Health Plans |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 547 | 557 | 1,812 | 1,343
Operating Segments | Molina Medicaid Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 14 | 5 | 26 | 13
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 5 | 2 | 16 | 8
Other operating |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Add: other operating revenues | 230 | 124 | 661 | 379
Add: gain on sale of subsidiary | 37 | 0 | 37 | 0
Total operating expenses | $ 538 | $ 769 | $ 1,693 | $ 2,029

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