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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 11, 2017
Condensed Financial Information of Registrant |  |  |  |  |
Interest paid on debt |  | $ 332,000,000 | $ 287,000,000 | $ 289,000,000 |
Allstate Corporation |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |
Notes due to subsidiaries |  | 250,000,000 | 0 |  |
Repayment of notes due to subsidiaries |  | 50,000,000 | 0 | 0 |
Interest paid on debt |  | $ 331,000,000 | $ 287,000,000 | $ 289,000,000 |
Kennett Capital Inc | Notes Due 2018 at 1.59 Percent, Note One | Subsidiaries | Allstate Corporation |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |
Notes due to subsidiaries |  |  |  |  | $ 125,000,000
Note stated interest rate (as a percent) |  |  |  |  | 1.59%
Allstate Non-Insurance Holdings Inc | Notes Due 2018 at 1.59 Percent, Note Two | Subsidiaries | Allstate Corporation |  |  |  |  |
Condensed Financial Information of Registrant |  |  |  |  |
Notes due to subsidiaries |  |  |  |  | $ 175,000,000
Repayment of notes due to subsidiaries | $ 50,000,000 |  |  |  |

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