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Restricted Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Summary of restricted investments by health plan
Restricted investments by health plan	$ 110	$ 109
Health Plans
Summary of restricted investments by health plan
Restricted investments by health plan	110	109
Health Plans | Florida
Summary of restricted investments by health plan
Restricted investments by health plan	22	34
Health Plans | Illinois
Summary of restricted investments by health plan
Restricted investments by health plan	3	0
Health Plans | Michigan
Summary of restricted investments by health plan
Restricted investments by health plan	1	1
Health Plans | New Mexico
Summary of restricted investments by health plan
Restricted investments by health plan	43	43
Health Plans | New York
Summary of restricted investments by health plan
Restricted investments by health plan	9	0
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 | Texas
Summary of restricted investments by health plan
Restricted investments by health plan	4	4
Health Plans | Utah
Summary of restricted investments by health plan
Restricted investments by health plan	4	4
Health Plans | Wisconsin
Summary of restricted investments by health plan
Restricted investments by health plan	1	1
Health Plans | Other
Summary of restricted investments by health plan
Restricted investments by health plan	$ 1	$ 0

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- References

No definition available.

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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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