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Segment Information - Schedule of Operating Segment Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments (in segment) | Segment | 3 |  |
Revenues | $ 17,782 | $ 14,178 | $ 9,667
Gross margin | 1,672 | 1,507 | 1,000
Depreciation and amortization | 182 | 126 | 134
Goodwill and intangible assets, net | 760 | 641 | 361
Total assets | 7,449 | 6,576 | 4,435
Health Plans |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 17,234 | 13,917 | 9,449
Gross margin | 1,618 | 1,447 | 947
Depreciation and amortization | 122 | 95 | 83
Goodwill and intangible assets, net | 513 | 393 | 286
Total assets | 5,897 | 4,707 | 3,355
Molina Medicaid Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 195 | 195 | 210
Gross margin | 21 | 55 | 53
Depreciation and amortization | 45 | 25 | 46
Goodwill and intangible assets, net | 72 | 73 | 75
Total assets | 267 | 213 | 185
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 353 | 66 | 8
Gross margin | 33 | 5 | 0
Depreciation and amortization | 15 | 6 | 5
Goodwill and intangible assets, net | 175 | 175 | 0
Total assets | $ 1,285 | $ 1,656 | $ 895

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