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Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2024 | Apr. 30, 2024 | Sep. 30, 2024 | May 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration for divestiture |  |  |  |  | $ 53 | $ 823 |  |  |
Casualty Claims |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration for divestiture | $ 224 |  |  |  |  |  |  |  |
Gain on transfer and sale | $ 194 |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |
Cost to sell | $ 8 |  |  |  |  |  |  |  |
Income tax expense | $ 33 |  |  |  |  |  |  |  |
Curbside Management and Public Safety Solutions |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on transfer and sale |  |  |  |  |  |  | $ 103 |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  | Gain (Loss) on Disposition of Business |  |
Cost to sell |  |  |  |  |  |  | $ 5 |  |
Income tax expense |  |  |  |  |  |  | $ 28 |  |
Definitive agreement to sell value |  |  |  |  |  |  |  | $ 230 |
BenefitWallet |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on transfer and sale |  |  | $ 0 | $ 425 |  |  |  |  |
Cost to sell |  |  |  | 11 |  |  |  |  |
Income tax expense |  |  |  | $ 102 |  |  |  |  |
Definitive agreement to sell value |  |  |  |  |  |  |  |  | $ 425
Cash consideration received in sale of business |  |  | $ 0 |  |  |  |  |  |
Divestitures | Curbside Management and Public Safety Solutions |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration received in sale of business |  | $ 181 |  |  |  |  |  |  |
Note receivable |  | $ 50 |  |  |  |  |  |  |

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