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Reporting Segments - Reportable segments financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 3,401 | $ 3,042 | $ 3,156
Goodwill impairment | $ (125) |  |  |  |  |  |  |  | (125) | 0 | 0
Net income applicable to common shareholders | $ 1,220 | $ 637 | $ 550 | $ 666 | $ 811 | $ 491 | $ 242 | $ 217 | 3,073 | 1,761 | 2,055
Allstate Protection |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 2,111 | 1,327 | 1,621
Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 2,012 | 1,220 | 1,566
Net investment income |  |  |  |  |  |  |  |  | 1,478 | 1,253 | 1,226
Income tax expense on operations |  |  |  |  |  |  |  |  | (1,119) | (812) | (922)
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | 272 | 0 | (154)
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 9 | 0 | 0
Change in accounting for investments in qualified affordable housing projects |  |  |  |  |  |  |  |  | 0 | 0 | (28)
Tax Legislation expense |  |  |  |  |  |  |  |  | (65) | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,587 | 1,661 | 1,688
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | (99) | (107) | (55)
Service Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 16 | 13 | 11
Tax Legislation expense |  |  |  |  |  |  |  |  | 134 | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 15 | 3 | 2
Adjusted net (loss) income |  |  |  |  |  |  |  |  | (59) | 3 | 2
Amortization of purchased intangible assets, after-tax |  |  |  |  |  |  |  |  | (60) | 0 | 0
Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 489 | 482 | 490
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | 2 | (24) | 1
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Change in accounting for investments in qualified affordable housing projects |  |  |  |  |  |  |  |  | 0 | 0 | (6)
Tax Legislation expense |  |  |  |  |  |  |  |  | 332 | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 577 | 219 | 229
Adjusted net (loss) income |  |  |  |  |  |  |  |  | 253 | 247 | 239
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | (10) | (4) | (4)
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 72 | 71 | 71
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | 0 | (4) | 0
Tax Legislation expense |  |  |  |  |  |  |  |  | 51 | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 146 | 96 | 104
Adjusted net (loss) income |  |  |  |  |  |  |  |  | 95 | 100 | 104
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,305 | 1,181 | 1,323
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | 28 | (26) | 172
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 4 | 3 | 3
Change in accounting for investments in qualified affordable housing projects |  |  |  |  |  |  |  |  | 0 | 0 | (11)
Tax Legislation expense |  |  |  |  |  |  |  |  | 182 | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 418 | 76 | 330
Adjusted net (loss) income |  |  |  |  |  |  |  |  | 204 | 101 | 166
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | 0 | (2) | (1)
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | 0 | 0 | 1
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 41 | 42 | 35
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (4) | (2) | 0
Goodwill impairment |  |  |  |  |  |  |  |  | (125) | 0 | 0
Business combination expenses, after-tax |  |  |  |  |  |  |  |  | (14) | 0 | 0
Tax Legislation expense |  |  |  |  |  |  |  |  | (128) | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (670) | (294) | (298)
Adjusted net (loss) income |  |  |  |  |  |  |  |  | $ (399) | $ (292) | $ (298)

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