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Goodwill and Intangible Assets - Balances of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |
Historical goodwill |  | $ 577
Accumulated impairment losses |  | (58)
Changes in the carrying amount of goodwill |  |
Beginning balance | $ 519 |
Acquisitions | 96 |
Purchase price allocation adjustments | 5 |
Ending balance | 620 |
Health Plans |  |
Goodwill [Line Items] |  |
Historical goodwill |  | 349
Accumulated impairment losses |  | (58)
Changes in the carrying amount of goodwill |  |
Beginning balance | 291 |
Acquisitions | 96 |
Purchase price allocation adjustments | 0 |
Ending balance | 387 |
Molina Medicaid Solutions |  |
Goodwill [Line Items] |  |
Historical goodwill |  | 71
Accumulated impairment losses |  | 0
Changes in the carrying amount of goodwill |  |
Beginning balance | 71 |
Acquisitions | 0 |
Purchase price allocation adjustments | 0 |
Ending balance | 71 |
Other |  |
Goodwill [Line Items] |  |
Historical goodwill |  | 157
Accumulated impairment losses |  | $ 0
Changes in the carrying amount of goodwill |  |
Beginning balance | 157 |
Acquisitions | 0 |
Purchase price allocation adjustments | 5 |
Ending balance | $ 162 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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