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Organization and Basis of Presentation (Details) member in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 22, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) position member | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) position member | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) member
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of states with programs | position |  |  | 18 |  | 18 |  |
Premium revenue |  |  | $ 6,583 | $ 4,372 | $ 12,889 | $ 8,676 |
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  | $ 1,000
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan | Hidalgo, Tarrant and Northeast Service Areas |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of members covered | member |  |  |  |  |  |  | 48
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan | Hidalgo Service Area |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of members covered | member |  |  |  |  |  |  | 2
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Purchase price | $ 60 |  |  |  |  |  |
Affinity health plan |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net cash paid in business combinations |  | $ 380 |  |  |  |  |
Health Plans |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of members eligible for the health care programs, approximately | member |  |  | 4,700 |  | 4,700 |  |
Minimum | Health Plans |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Contract term |  |  |  |  | 3 years |  |
Maximum | Health Plans |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Contract term |  |  |  |  | 5 years |  |

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