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Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2025 | Apr. 01, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on disposition of operations |  |  | $ 890 |  | $ 0 | $ 890 | $ 0 |
Disposal Group, Held-for-Sale, Not Discontinued Operations | EVB |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal |  | $ 1,900 |  |  |  |  |  |
Gain on disposition of operations |  |  | 890 |  |  |  |  |
Gain on sale of business after tax |  |  | 643 |  |  |  |  |
Premiums and contract charges |  |  |  | $ 243 |  |  |  |
Adjusted net income (loss) by segment, after-tax |  |  |  | $ 22 |  |  |  |
Accumulated other comprehensive losses |  | 51 |  |  |  |  |  |
Reserve for future policy benefits |  | $ 1,096 |  |  |  |  |  | $ 1,085
Disposal Group, Held-for-Sale, Not Discontinued Operations | Group Health |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Premiums and contract charges |  |  | 123 |  |  | 247 |  |
Adjusted net income (loss) by segment, after-tax |  |  | $ 9 |  |  | $ 21 |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Group Health | Subsequent Event |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal | $ 1,250 |  |  |  |  |  |  |
Reserve for future policy benefits | $ 219 |  |  |  |  |  |  |
Number of period provided for transition services | 24 months |  |  |  |  |  |  |

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