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Restricted Investments, Non-current - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Summary of restricted investments by health plan |  |
Restricted investments by health plan | $ 119 | $ 110
Health Plans |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | 119 | 110
Health Plans | Florida |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | 31 | 22
Health Plans | New Mexico |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | 43 | 43
Health Plans | Ohio |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | 12 | 12
Health Plans | Puerto Rico |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | 10 | 10
Health Plans | Other |  |
Summary of restricted investments by health plan |  |
Restricted investments by health plan | $ 23 | $ 23

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Balance Type: |
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- Details
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- Details
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