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Organization and Basis of Presentation (Details) member in Thousands, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2021 USD ($) | Oct. 07, 2021 USD ($) | Apr. 22, 2021 USD ($) | Sep. 30, 2021 member position | Sep. 30, 2021 USD ($) member position | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) member position | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) member | Aug. 31, 2021 position
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Contract term |  |  |  | 4 years |  |  |  |  |  |
Net cash paid in business combinations |  |  |  |  |  |  | $ 0 | $ 62 |  |
Premium revenue |  |  |  |  | $ 6,800 | $ 4,768 | $ 19,689 | $ 13,444 |  |
Extension option |  |  |  | 2 years |  |  |  |  |  |
AgeWell New York | New York |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Number of members covered | position |  |  |  |  |  |  |  |  |  | 13,000
Premium revenue |  |  |  |  |  |  |  |  | $ 700 |
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 |
New York Acquisition—Medicaid | Subsequent event |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash paid in business combinations | $ 380 |  |  |  |  |  |  |  |  |
Total Purchase price |  | $ 110 |  |  |  |  |  |  |  |
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Purchase price |  |  | $ 60 |  |  |  |  |  |  |
Health Plans |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Number of members eligible for the health care programs, approximately | member |  |  |  | 4,800 | 4,800 |  | 4,800 |  |  |
Number of states with programs | position |  |  |  | 18 | 18 |  | 18 |  |  |
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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