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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2025 | May 14, 2025 | Jun. 09, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 24, 2025 | May 14, 2024 | Jun. 17, 2022
Condensed Financial Information of Registrant |  |  |  |  |  |  |  |  |
Interest paid on debt |  |  |  | $ 395 | $ 395 | $ 355 |  |  |
Allstate Corporation |  |  |  |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |  |  |  |
Notes due to subsidiaries |  |  |  | 0 | 350 |  |  |  |
Repayment of notes due to subsidiaries |  |  |  | 88 | 0 | 1,000 |  |  |
Interest paid on debt |  |  |  | 395 | $ 395 | $ 355 |  |  |
Subsidiaries | Allstate Corporation |  |  |  |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |  |  |  |
Repayment of notes due to subsidiaries |  |  |  | $ 262 |  |  |  |  |
National General Holdings Corp. Acquisitions | Subsidiaries | Allstate Corporation | Notes Receivable |  |  |  |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |  |  |  |
Notes receivable |  | $ 175 |  |  |  |  | $ 110 | $ 350 |
Note stated interest rate (as a percent) |  | 4.85% |  |  |  |  | 4.03% | 5.68% |
Repayment of notes due to subsidiaries | $ 175 | $ 350 |  |  |  |  |  |  |
Kennett Capital Inc | Subsidiaries | Allstate Corporation |  |  |  |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |  |  |  |
Notes due to subsidiaries |  |  |  |  |  |  |  | $ 350 | $ 1,000
Note stated interest rate (as a percent) |  |  |  |  |  |  |  | 5.57% | 1.63%
Repayment of notes due to subsidiaries |  | $ 350 | $ 1,000 |  |  |  |  |  |

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