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Reporting Segments - Performance data and tax items (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information |  |  |
Amortization of DAC | $ 5,222 | $ 4,784 | $ 4,550
Income tax expense | 468 | 995 | 842
Allstate Protection |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 4,475 | 4,205 | 4,053
Service Businesses |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 463 | 296 | 214
Income tax expense | (19) | (194) | 2
Allstate Life |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 132 | 134 | 131
Income tax expense | 75 | (226) | 94
Allstate Benefits |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 145 | 142 | 145
Income tax expense | 32 | 1 | 52
Allstate Annuities |  |  |
Segment Reporting Information |  |  |
Amortization of DAC | 7 | 7 | 7
Income tax expense | (66) | (58) | 36
Property-Liability |  |  |
Segment Reporting Information |  |  |
Income tax expense | 613 | 1,285 | 859
Corporate and Other |  |  |
Segment Reporting Information |  |  |
Income tax expense | $ (167) | $ 187 | $ (201)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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