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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 18, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 29, 2020 | Jun. 19, 2019
Condensed Financial Information of Registrant |  |  |  |  |  |
Interest paid on debt |  | $ 311 | $ 312 | $ 330 |  |
Allstate Corporation |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |
Notes due to subsidiaries |  | 1,250 | 1,000 |  |  |
Repayment of notes due to subsidiaries |  | 1,000 | 1,250 | 250 |  |
Interest paid on debt |  | $ 311 | $ 312 | $ 330 |  |
Kennett Capital Inc | Subsidiaries | Allstate Corporation |  |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |  |
Notes due to subsidiaries | $ 1,000 |  |  |  | $ 250 | $ 1,000
Note stated interest rate (as a percent) | 0.43% |  |  |  | 0.33% | 2.63%
Repayment of notes due to subsidiaries | $ 1,000 |  |  |  |  |

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