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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Receivable from related party |  | $ 5
Pacific Healthcare IPA |  |
Related Party Transaction [Line Items] |  |
Ownership percentage |  | 50.00%
Pacific Healthcare IPA | Provider Agreement with Pacific Healthcare IPA |  |
Related Party Transaction [Line Items] |  |
Payments under provider agreement | $ 1 |

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