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Restructuring and Separation Costs - Expected Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs | $ 43 | $ 0 |  | $ 43 | $ 0 |
Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 170 |  |  | 170 |  |
Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 190 |  |  | 190 |  |
Separation Costs–Former Executives | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 60 |  |  | 60 |  |
Separation Costs–Former Executives | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 70 |  |  | 70 |  |
Other Restructuring Costs | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 110 |  |  | 110 |  |
Other Restructuring Costs | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 120 |  |  | 120 |  |
Health Plans |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs | 0 | 0 |  | 0 | 0 |
Health Plans | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 80 |  |  | 80 |  |
Health Plans | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 90 |  |  | 90 |  |
Health Plans | Separation Costs–Former Executives | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 25 |  |  | 25 |  |
Health Plans | Separation Costs–Former Executives | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 30 |  |  | 30 |  |
Health Plans | Other Restructuring Costs | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 55 |  |  | 55 |  |
Health Plans | Other Restructuring Costs | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 60 |  |  | 60 |  |
Other segment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs | 43 | $ 0 |  | 43 | $ 0 |
Other segment | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 90 |  |  | 90 |  |
Other segment | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 100 |  |  | 100 |  |
Other segment | Separation Costs–Former Executives | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 35 |  |  | 35 |  |
Other segment | Separation Costs–Former Executives | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 40 |  |  | 40 |  |
Other segment | Other Restructuring Costs | Minimum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | 55 |  |  | 55 |  |
Other segment | Other Restructuring Costs | Maximum |  |  |  |  |  |
Estimated Costs Expected to be Incurred by Reportable Segment |  |  |  |  |  |
Total restructuring costs | $ 60 |  |  | $ 60 |  |
Forecast |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  | $ 40
Forecast | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs |  |  | $ 130 |  |  |
Forecast | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and separation costs |  |  | $ 150 |  |  |

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