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Restricted Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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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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