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Reporting Segments - Reportable segments financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | $ 3,159 | $ 3,240 | $ 3,401
Goodwill impairment |  |  |  |  |  |  |  |  | $ (125) | (106) | 0 | (125)
Net income applicable to common shareholders | $ 1,707 | $ 889 | $ 821 | $ 1,261 | $ (585) | $ 942 | $ 678 | $ 977 |  | 4,678 | 2,012 | 3,438
Allstate Protection |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  |  | 2,912 | 2,343 | 2,304
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  |  | (108) | (90) | (99)
Property-Liability |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  |  | 2,804 | 2,253 | 2,205
Net investment income |  |  |  |  |  |  |  |  |  | 1,533 | 1,464 | 1,478
Income tax expense on operations |  |  |  |  |  |  |  |  |  | (887) | (747) | (1,187)
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 1,161 | (500) | 272
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 9
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | (5) | 36
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | 4,611 | 2,465 | 2,813
Service Businesses |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 42 | 27 | 16
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 25 | (9) | 0
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | (4) | 137
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | (77) | (79) | 23
Adjusted net income (loss) |  |  |  |  |  |  |  |  |  | 38 | 8 | (54)
Amortization of purchased intangibles, after-tax |  |  |  |  |  |  |  |  |  | (97) | (74) | (60)
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax |  |  |  |  |  |  |  |  |  | (43) | 0 | 0
Allstate Life |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 514 | 505 | 489
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 0 | (11) | 2
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | (16) | 338
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | 247 | 260 | 589
Adjusted net income (loss) |  |  |  |  |  |  |  |  |  | 261 | 295 | 259
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  |  | (9) | 0 | 0
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  |  | (5) | (8) | (10)
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 83 | 77 | 72
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 9 | (7) | 0
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | 0 | 54
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | 124 | 118 | 154
Adjusted net income (loss) |  |  |  |  |  |  |  |  |  | 115 | 124 | 100
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  |  | 0 | 1 | 0
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 917 | 1,096 | 1,305
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 274 | (131) | 28
Gain (loss) on disposition of operations, after-tax |  |  |  |  |  |  |  |  |  | 4 | 4 | 4
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | 69 | 182
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | 282 | 76 | 419
Adjusted net income (loss) |  |  |  |  |  |  |  |  |  | 10 | 131 | 205
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  |  | (6) | 3 | 0
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 70 | 71 | 41
Realized capital gains and losses, after-tax |  |  |  |  |  |  |  |  |  | 19 | (30) | (4)
Pension and other postretirement remeasurement gains and losses, after-tax |  |  |  |  |  |  |  |  |  | (90) | (370) | 141
Tax Legislation (expense) benefit |  |  |  |  |  |  |  |  |  | 0 | (15) | (238)
Goodwill impairment |  |  |  |  |  |  |  |  |  | 0 | 0 | (125)
Business combination expenses, after-tax |  |  |  |  |  |  |  |  |  | 0 | (7) | (14)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  |  | (509) | (828) | (560)
Adjusted net income (loss) |  |  |  |  |  |  |  |  |  | $ (438) | $ (406) | $ (320)

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