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Reporting Segments - Impacts of Tax Legislation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information |  |  |
Total income tax expense | $ 1,242 | $ 468 | $ 995
Property-Liability |  |  |
Segment Reporting Information |  |  |
Total income tax expense | 1,196 | 613 | 1,285
Service Businesses |  |  |
Segment Reporting Information |  |  |
Total income tax expense | (18) | (19) | (194)
Allstate Life |  |  |
Segment Reporting Information |  |  |
Total income tax expense | 53 | 75 | (226)
Allstate Benefits |  |  |
Segment Reporting Information |  |  |
Total income tax expense | 35 | 32 | 1
Allstate Annuities |  |  |
Segment Reporting Information |  |  |
Total income tax expense | 73 | (66) | (58)
Corporate and Other |  |  |
Segment Reporting Information |  |  |
Total income tax expense | $ (97) | $ (167) | $ 187

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