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Reporting Segments - Performance data and tax items (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |
Amortization of DAC | $ 4,784 | $ 4,550 | $ 4,364
Income tax expense | 802 | 877 | 1,111
Allstate Protection |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 4,205 | 4,053 | 3,933
Service Businesses |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 296 | 214 | 169
Income tax expense | (193) | 0 | 2
Allstate Life |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 134 | 131 | 133
Income tax expense | (224) | 91 | 108
Allstate Benefits |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 142 | 145 | 124
Income tax expense | 1 | 51 | 55
Allstate Annuities |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 7 | 7 | 5
Income tax expense | (58) | 36 | 188
Property-Liability |  |  |
Segment Reporting Information |  |  |
Income tax expense | 1,318 | 806 | 867
Corporate and Other |  |  |
Segment Reporting Information |  |  |
Income tax expense | $ (42) | $ (107) | $ (109)

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