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Statutory Financial Information and Dividend Limitations (Tables) | 12 Months Ended
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Dec. 31, 2019
Statutory Financial Information and Dividend Limitations [Abstract] |
Statutory net income and capital and surplus |
Statutory net income (loss) and capital and surplus of Allstate’s domestic insurance subsidiaries
|  | Net income (loss) |  | Capital and surplus
($ in millions) |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018
Amounts by major business type: |  |  |  |  |  |  |  |  |  |
Property and casualty insurance |  | $ | 3,989 |  |  | $ | 2,939 |  |  | $ | 3,050 |  |  | $ | 16,192 |  |  | $ | 14,328 |
Life insurance, annuities and voluntary accident and health insurance |  | 422 |  |  | 465 |  |  | 327 |  |  | 4,208 |  |  | 3,819 |
Amount per statutory accounting practices |  | $ | 4,411 |  |  | $ | 3,404 |  |  | $ | 3,377 |  |  | $ | 20,400 |  |  | $ | 18,147 |

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