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Restricted Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Summary of restricted investments by health plan
Restricted investments by health plan	$ 120	$ 119
Health Plans
Summary of restricted investments by health plan
Restricted investments by health plan	120	119
Health Plans | Florida
Summary of restricted investments by health plan
Restricted investments by health plan	32	31
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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- 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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- Details

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- Details

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- Details

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- Details

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