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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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