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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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