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Restructuring and Separation Costs - Separation Costs (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) position
Restructuring Cost and Reserve [Line Items]
Costs recognized	$ 43	$ 43
Acceleration of share-based compensation		$ 23
Number of full-time equivalent positions eliminated (in position) | position		1,500
Workforce concentration risk | Number of positions eliminated in total workforce
Restructuring Cost and Reserve [Line Items]
Workforce reduction		10.00%
Workforce concentration risk | Number of positions eliminated in health plans workforce
Restructuring Cost and Reserve [Line Items]
Workforce reduction		7.00%
Separation Costs–Former Executives
Restructuring Cost and Reserve [Line Items]
Costs recognized		$ 35
Acceleration of share-based compensation		$ 23
Deferred termination fee | Executive Officers
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary		400.00%
Deferred bonus | Former CEO
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary		150.00%
Deferred bonus | Former CFO
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary		125.00%

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- Definition

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The expected number of positions to be eliminated as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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