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Organization and Basis of Presentation (Details) member in Thousands, $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) member state | Oct. 31, 2019 | Jun. 30, 2020 USD ($) member county | Dec. 31, 2019 USD ($) member segment state | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 2 |  |
Premium revenue |  |  |  | $ 16,208 | $ 17,612 | $ 18,854
Texas |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | member | 97 |  |  | 97 |  |
Premium revenue |  |  |  | $ 2,062 |  |
Texas Health and Human Services Commission, STARPLUS Program |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Contract term |  | 3 years |  |  |  |
Health Plans |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of states in which company operates (in state) | state | 14 |  |  | 14 |  |
Number of members eligible for the health care programs | member | 3,300 |  |  | 3,300 |  |
Minimum contract terms |  |  |  | 3 years |  |
Maximum contract term |  |  |  | 5 years |  |
Premium revenue |  |  |  | $ 16,208 | 17,612 | 18,854
Health Plans | Texas |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | 2,991 | 3,244 | 2,813
Health Plans | Illinois |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Premium revenue |  |  |  | $ 1,002 | $ 793 | $ 593
Health Plans | STAR/CHIP Contracts | Texas |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | member | 114 |  |  | 114 |  |
Premium revenue |  |  |  | $ 315 |  |
NextLevel Health Partners, Inc. | Illinois |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | member | 50 |  |  | 50 |  |
Purchase price of assets | $ 50 |  |  |  |  |
YourCare Health Plan | Forecast | New York |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of members served, approximately (in member) | member |  |  | 46 |  |  |
Purchase price of assets |  |  | $ 40 |  |  |
Number of countries | county |  |  | 7 |  |  |

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