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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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