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Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill impairment charges |  | $ 0 |  | $ 0
Impairment of intangible assets |  | 0 |  | $ 0
Future Amortization Expenses |  |  |  |
Future amortization expense, 2019 |  | 18,000,000 |  |
Future amortization expense, 2020 |  | 14,000,000 |  |
Future amortization expense, 2021 |  | 5,000,000 |  |
Future amortization expense, 2022 |  | 3,000,000 |  |
Future amortization expense, 2023 |  | $ 3,000,000 |  |
Health Plans |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill impairment charges |  |  | $ 244,000,000 |
Impairment of intangible assets | $ (25,000,000) |  |  |
Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill impairment charges |  |  | $ 190,000,000 |
Impairment of intangible assets | $ 11,000,000 |  |  |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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