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Commitments and Contingencies (Details) member in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2015 plaintiff | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) member | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) member | Jun. 30, 2016 USD ($) | Jul. 28, 2017 USD ($) | Dec. 31, 2016 USD ($)
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Net assets of subsidiaries subject to restrictions |  |  | $ 1,526 |  |  | $ 1,526 |  |  | $ 1,492
Aggregate statutory capital and surplus |  |  | 1,662 |  |  | 1,662 |  |  |
Required minimum statutory capital surplus |  |  | 1,118 |  |  | 1,118 |  |  |
Premium stabilization program, risk corridor, prior years |  |  | 52 |  |  | 52 |  |  |
Premium stabilization program, risk corridor, current year |  |  | 76 |  |  | 76 |  |  |
Premium revenue |  |  | 4,740 |  | $ 4,029 | 9,388 | $ 8,024 |  |
Receivables |  |  | $ 1,006 |  |  | $ 1,006 |  |  | 974
Illinois |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Number of members served, approximately | member |  |  | 163 |  |  | 163 |  |  |
Puerto Rico |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Number of members served, approximately | member |  |  | 322 |  |  | 322 |  |  |
Health Plans | Illinois |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  | $ 310 |  |  |  |  |
Health Plans | Illinois | Subsequent Event |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  |  |  | $ 116 |
Health Plans | Puerto Rico |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  | $ 362 |  |  |
The Rodriquez Litigation |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 7 |  |  |  |  |  |  |  |
Rutherford County, Tennessee |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Liabilities arising from contingencies, amount recognized |  | $ 3 |  |  |  |  |  |  |
Pathways Health and Community Support LLC |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Liabilities arising from contingencies, amount recognized |  | $ 14 |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Restricted investments |  |  | $ 165 |  |  | $ 165 |  |  | $ 264

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