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Commitments and Contingencies (Details) member in Thousands, $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2015 plaintiff | Mar. 31, 2017 USD ($) member | Mar. 31, 2016 USD ($) | Apr. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Entity Information [Line Items] |  |  |  |  |  |
Net assets of subsidiaries subject to restrictions |  | $ 1,527 |  |  | $ 1,492 |
Aggregate statutory capital and surplus |  | 1,722 |  |  |  |
Required minimum statutory capital surplus |  | 1,100 |  |  |  |
Premium stabilization program, risk corridor, prior years |  | 52 |  |  |  |
Premium stabilization program, risk corridor, current year |  | 90 |  |  |  |
Premium revenue |  | 4,648 | $ 3,995 |  |  |
Receivables |  | $ 1,006 |  |  | 974 |
Illinois |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Number of members served, approximately | member |  | 194 |  |  |  |
Puerto Rico |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Number of members served, approximately | member |  | 326 |  |  |  |
Premium revenue |  | $ 183 |  |  |  |
Health Plans | Illinois |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Premium revenue |  | 161 |  |  |  |
Health Plans | Illinois | Subsequent Event |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Receivables |  |  |  | $ 80 |  |
Parent Company |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Restricted cash and investments |  | $ 273 |  |  | $ 264 |
The Rodriquez Litigation |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Number of plaintiffs | plaintiff | 7 |  |  |  |  |
Pathways Health and Community Support LLC |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Liabilities arising from contingencies, amount recognized |  |  |  |  |  | $ 14
Executives | Deferred Termination Fee |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Deferred compensation arrangement, cash awards granted, percentage of base salary |  | 400.00% |  |  |  |
CEO | Deferred Bonus |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Deferred compensation arrangement, cash awards granted, percentage of base salary |  | 150.00% |  |  |  |
CFO | Deferred Bonus |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Deferred compensation arrangement, cash awards granted, percentage of base salary |  | 125.00% |  |  |  |

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