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Commitments and Contingencies (Details) member in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2015 plaintiff | Dec. 31, 2016 USD ($) member Lease_Renewal_Option | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) member Lease_Renewal_Option | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 | Dec. 31, 2009 | Feb. 24, 2017 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets of subsidiaries subject to restrictions |  | $ 1,492 |  |  |  | $ 1,229 |  |  |  | $ 1,492 | $ 1,229 |  |  |  |
Aggregate statutory capital and surplus |  | 1,693 |  |  |  |  |  |  |  | 1,693 |  |  |  |  |
Required minimum statutory capital surplus |  | 1,100 |  |  |  |  |  |  |  | 1,100 |  |  |  |  |
Unrecorded receivable for Marketplace risk corridor, prior year |  | 52 |  |  |  |  |  |  |  | 52 |  |  |  |  |
Unrecorded receivable for Marketplace risk corridor, current year |  | 90 |  |  |  |  |  |  |  | 90 |  |  |  |  |
Premium revenue |  | 4,177 | $ 4,191 | $ 4,029 | $ 3,995 | 3,589 | $ 3,377 | $ 3,304 | $ 2,971 | 16,392 | 13,241 | $ 9,023 |  |  |
Rental expense related to leases |  |  |  |  |  |  |  |  |  | $ 64 | 44 | 32 |  |  |
Executive Officer | Termination Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation upon termination as a percentage of base salary |  |  |  |  |  |  |  |  |  | 400.00% |  |  |  |  |
Chief Executive Officer | Termination Bonus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation upon termination as a percentage of base salary |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |
Chief Financial Officer | Termination Bonus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation upon termination as a percentage of base salary |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and investments |  | $ 264 |  |  |  | 612 |  |  |  | $ 264 | 612 |  |  |  |
Termination of hospital management agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement charge |  |  |  |  |  | $ 15 |  |  |  |  |  |  |  |  |
Executive Officer | Employment Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Automatically extension term |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Period of employment agreements |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease terms |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Operating lease renewal options | Lease_Renewal_Option |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Minimum | Executive Officer | Employment Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employment agreements terms |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease terms |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Operating lease renewal options | Lease_Renewal_Option |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |
Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 195 |  |  |  |  |  |  |  | 195 |  |  |  |  |
Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  | 330 |  |  |  |  |  |  |  | 330 |  |  |  |  |
Subsequent Event | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 68
Health Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  |  | $ 16,392 | 13,241 | 9,023 |  |  |
Health Plans | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  |  | 601 | 397 | 153 |  |  |
Health Plans | Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  |  | $ 726 | $ 567 | $ 0 |  |  |
PCC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-acquisition contingent liability and corresponding indemnification asset |  |  | $ 14 |  |  |  |  |  |  |  |  |  |  |  |
The Rodriquez Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs (in plaintiff) | plaintiff | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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