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Significant Accounting Policies - Narrative (Details) store in Thousands, clinic in Thousands, people in Millions, patient in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2025 USD ($) clinic people patient store | Mar. 31, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) segment clinic people patient store | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) program
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of pharmacy plan members | people | 87 |  |  | 87 |  |
Number of patients served per year (more than) | patient | 0.8 |  |  | 0.8 |  |
Number of reportable segments | segment |  |  |  | 4 |  |
Allowance for credit losses | $ 374 |  |  | $ 374 |  | $ 407
Total premium deficiency reserve |  |  | $ 0 |  | $ 0 |
Premium deficiency reserve | 902 |  | $ 0 | 902 | 0 |
Loss on Accountable Care assets | 41 |  |  | 288 |  |
Pre-tax loss on divestiture |  |  |  | (236) | $ 0 |
Individual Exchange Product Line |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total premium deficiency reserve |  | $ 448 |  |  |  |
Premium deficiency reserve, charge of unamortized acquisition costs |  | 17 |  |  |  |
Premium deficiency reserve, charge to health care costs |  | $ 431 |  |  |  |
Premium deficiency reserve | 431 |  |  | 431 |  |
Group Medicare Advantage Product Line |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total premium deficiency reserve | 471 |  |  |  |  |
Premium deficiency reserve | $ 471 |  |  | $ 471 |  |
Pharmacy & Consumer Wellness |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of retail locations | store | 9 |  |  | 9 |  |
Health Services |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of walk in medical clinics (more than) | clinic | 1 |  |  | 1 |  |
Number of programs administered | program |  |  |  |  |  | 2
Loss on Accountable Care assets | $ 41 |  |  | $ 288 |  |
Loss on termination of program | $ 41 |  |  | 52 |  |
Health Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | MSSP |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Pre-tax loss on divestiture |  |  |  | (236) |  |
Intangible assets and goodwill removed due to divestiture |  |  |  | $ 342 |  |
Health Care Benefits |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of people served (more than) | people | 37 |  |  | 37 |  |

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