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Reporting Segments - Reportable segments financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 3,240 | $ 3,401 | $ 3,042
Goodwill impairment |  |  |  |  | $ (125) |  |  |  | 0 | (125) | 0
Net income applicable to common shareholders | $ (585) | $ 942 | $ 678 | $ 977 | $ 1,294 | $ 810 | $ 549 | $ 785 | 2,012 | 3,438 | 1,692
Allstate Protection |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 2,343 | 2,304 | 1,477
Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 2,253 | 2,205 | 1,370
Net investment income |  |  |  |  |  |  |  |  | 1,464 | 1,478 | 1,253
Income tax expense on operations |  |  |  |  |  |  |  |  | (747) | (1,187) | (865)
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (500) | 272 | 0
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 0 | 9 | 0
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | (5) | 36 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,465 | 2,813 | 1,758
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 2,253 | 2,205 | 1,370
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | (90) | (99) | (107)
Service Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 27 | 16 | 13
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (9) | 0 | 0
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | (4) | 137 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (79) | 23 | 5
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 8 | (54) | 5
Amortization of purchased intangible assets, after-tax |  |  |  |  |  |  |  |  | (74) | (60) | 0
Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 505 | 489 | 482
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (11) | 2 | (24)
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | (16) | 338 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 260 | 589 | 223
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 295 | 259 | 251
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | (8) | (10) | (4)
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 77 | 72 | 71
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (7) | 0 | (4)
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | 0 | 54 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 118 | 154 | 99
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 124 | 100 | 103
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | 1 | 0 | 0
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,096 | 1,305 | 1,181
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (131) | 28 | (26)
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 4 | 4 | 3
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | 69 | 182 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 76 | 419 | 77
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 131 | 205 | 102
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | 3 | 0 | (2)
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 71 | 41 | 42
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  | (30) | (4) | (2)
Pension and other postretirement remeasurement gains and losses, after-tax |  |  |  |  |  |  |  |  | (370) | 141 | (175)
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  | (15) | (238) | 0
Goodwill impairment |  |  |  |  |  |  |  |  | 0 | (125) | 0
Business combination expenses, after-tax |  |  |  |  |  |  |  |  | (7) | (14) | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (828) | (560) | (470)
Adjusted net income (loss) |  |  |  |  |  |  |  |  | $ (406) | $ (320) | $ (293)

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