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Reporting Segments - Total assets and investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Segment Reporting Information |  |  |
Assets | $ 112,422 | $ 108,610 |
Investments | 82,803 | 81,799 |
Property-Liability |  |  |
Segment Reporting Information |  |  |
Assets | 60,197 | 60,390 | $ 55,670
Investments | 43,183 | 42,720 | 38,480
Allstate Financial |  |  |
Segment Reporting Information |  |  |
Assets |  | 45,950 | 46,340
Investments |  | 36,840 | 36,790
Service Businesses |  |  |
Segment Reporting Information |  |  |
Assets | 4,531 |  |
Investments | 954 |  |
Allstate Life |  |  |
Segment Reporting Information |  |  |
Assets | 14,107 |  |
Investments | 11,210 |  |
Allstate Benefits |  |  |
Segment Reporting Information |  |  |
Assets | 2,766 |  |
Investments | 1,776 |  |
Allstate Annuities |  |  |
Segment Reporting Information |  |  |
Assets | 28,836 |  |
Investments | 23,722 |  |
Corporate and Other |  |  |
Segment Reporting Information |  |  |
Assets | 1,985 | 2,270 | 2,640
Investments | $ 1,958 | $ 2,240 | $ 2,490

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