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Business Combinations (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2016 USD ($) member | Mar. 01, 2016 USD ($) member | Jan. 01, 2016 USD ($) member | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) member | Dec. 31, 2016 USD ($) member | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill recorded to the Health Plans segment |  |  |  |  |  | $ 96 |
Weighted-average amortization period for intangible assets |  |  |  |  |  | 5 years 8 months |
Increase in goodwill from tax-related gross-up payments |  |  |  |  |  | $ 5 |
Funding of acquisitions closed on January 1, 2016 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  | $ 101 |  |  |
Pathways Health and Community Support LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Pre-acquisition contingent liability and corresponding indemnification asset |  |  |  |  |  |  | $ 14
Portion of goodwill acquired that is tax deductible |  |  |  |  |  |  | 50.00%
Increase in goodwill from tax-related gross-up payments |  |  |  |  | $ 5 |  |
Illinois |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members served, approximately (in member) | member |  |  |  |  | 195,000 | 195,000 |
Illinois | Accountable Care Chicago, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 30 |  |  |  |
Illinois | Accountable Care Chicago, LLC | Medicaid |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members added, approximately (in member) | member |  |  | 50,000 |  |  |  |
Illinois | Loyola Physician Partners, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 12 |  |  |  |
Illinois | Loyola Physician Partners, LLC | Medicaid |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members added, approximately (in member) | member |  |  | 18,000 |  |  |  |
Illinois | Better Health Network, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  | $ 15 |  |  |  |  |
Illinois | Better Health Network, LLC | Medicaid |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members added, approximately (in member) | member |  | 28,000 |  |  |  |  |
Michigan | HAP Midwest Health Plan, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 31 |  |  |  |
Number of members served, approximately (in member) | member |  |  | 68,000 |  |  |  |
New York | Today's Options Of New York, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price | $ 38 |  |  |  |  |  |
New York | Today's Options Of New York, Inc. | Medicaid |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members added, approximately (in member) | member | 35,000 |  |  |  |  |  |
Washington | Columbia United Providers, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 28 |  |  |  |
Washington | Columbia United Providers, Inc. | Medicaid |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of members added, approximately (in member) | member |  |  | 57,000 |  |  |  |

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