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Goodwill and Intangible Assets, Net - Balances of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Historical goodwill |  | $ 678,000,000 |
Accumulated impairment losses | $ (492,000,000) | (58,000,000) |
Changes in the carrying amount of goodwill |  |  |
Beginning balance | 620,000,000 |  |
Impairment losses, year ended December 31, 2017 | (434,000,000) | 0 |
Ending balance | 186,000,000 | 620,000,000 |
Health Plans |  |  |
Goodwill [Line Items] |  |  |
Historical goodwill |  | 445,000,000 |
Accumulated impairment losses | (302,000,000) | (58,000,000) |
Changes in the carrying amount of goodwill |  |  |
Beginning balance | 387,000,000 |  |
Impairment losses, year ended December 31, 2017 | (244,000,000) |  |
Ending balance | 143,000,000 | 387,000,000 |
Molina Medicaid Solutions |  |  |
Goodwill [Line Items] |  |  |
Historical goodwill |  | 71,000,000 |
Accumulated impairment losses | (28,000,000) | 0 |
Changes in the carrying amount of goodwill |  |  |
Beginning balance | 71,000,000 |  |
Impairment losses, year ended December 31, 2017 | (28,000,000) |  |
Ending balance | 43,000,000 | 71,000,000 |
Other |  |  |
Goodwill [Line Items] |  |  |
Historical goodwill |  | 162,000,000 |
Accumulated impairment losses | (162,000,000) | 0 |
Changes in the carrying amount of goodwill |  |  |
Beginning balance | 162,000,000 |  |
Impairment losses, year ended December 31, 2017 | (162,000,000) |  |
Ending balance | $ 0 | $ 162,000,000 |

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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=77989000&loc=SL49117168-202975 + Details
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- Definition Amount before 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,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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