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Significant Accounting Policies - Narrative (Details) store in Thousands, people in Millions, patient in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) people patient clinic store | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) people patient state Segment clinic store | Sep. 30, 2023 USD ($) | Dec. 31, 2023 business
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of pharmacy plan members | people | 90 |  | 90 |  |
Number of patients served per year (more than) | patient | 0.8 |  | 0.8 |  |
Number of reportable segments | Segment |  |  | 4 |  |
Number of businesses acquired | business |  |  |  |  | 2
Total premium deficiency reserve |  | $ 0 |  | $ 0 |
Medicare Product Line |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Total premium deficiency reserve | $ 766 |  | $ 766 |  |
Premium deficiency reserve, charge for unamortized acquisition costs | 383 |  | 383 |  |
Premium deficiency reserve, charge to health care costs | 383 |  | 383 |  |
Individual Exchange Product Line |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Total premium deficiency reserve | 270 |  | 270 |  |
Premium deficiency reserve, charge for unamortized acquisition costs | 11 |  | 11 |  |
Premium deficiency reserve, charge to health care costs | 259 |  | 259 |  |
Medicaid Product Line |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Premium deficiency reserve, charge to health care costs | $ 28 |  | $ 28 |  |
Pharmacy & Consumer Wellness |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of retail locations (more than) | store | 9 |  | 9 |  |
Health Services |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of walk in medical clinics (more than) | clinic | 900 |  | 900 |  |
Number of primary care medical clinics (more than) | clinic | 225 |  | 225 |  |
Health Care Benefits |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of people served (more than) | people | 36 |  | 36 |  |
Number of states in which the Company has entered the individual public health insurance exchange | state |  |  | 17 |  |

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- Definition Premium Deficiency Testing Expense, Short-Duration Contract, Policyholder Benefits and Claims Incurred, Net, Amount + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. 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