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Reportable Segments - Reportable segments financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 2,853 | $ 3,159 | $ 3,240
Net income applicable to common shareholders | $ 2,598 | $ 1,126 | $ 1,224 | $ 513 | $ 1,707 | $ 889 | $ 821 | $ 1,261 | 5,461 | 4,678 | 2,012
Allstate Protection |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 4,566 | 2,912 | 2,343
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | (144) | (108) | (90)
Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Underwriting income |  |  |  |  |  |  |  |  | 4,422 | 2,804 | 2,253
Net investment income |  |  |  |  |  |  |  |  | 1,421 | 1,533 | 1,464
Income tax expense on operations |  |  |  |  |  |  |  |  | (1,166) | (887) | (747)
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | 774 | 1,161 | (500)
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | (5)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 5,451 | 4,611 | 2,465
Protection Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 44 | 42 | 27
Adjusted net income |  |  |  |  |  |  |  |  | 153 | 38 | 8
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | 23 | 25 | (9)
Amortization of purchased intangibles, after-tax |  |  |  |  |  |  |  |  | (84) | (97) | (74)
Impairment of purchased intangibles, after-tax |  |  |  |  |  |  |  |  | 0 | (43) | 0
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | (4)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 92 | (77) | (79)
Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 502 | 514 | 505
Adjusted net income |  |  |  |  |  |  |  |  | 194 | 261 | 295
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | (9) | 0 | (11)
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | (34) | (9) | 0
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | 8 | (5) | (8)
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | (16)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 159 | 247 | 260
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 78 | 83 | 77
Adjusted net income |  |  |  |  |  |  |  |  | 96 | 115 | 124
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | 7 | 9 | (7)
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
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 103 | 124 | 118
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 761 | 917 | 1,096
Adjusted net income |  |  |  |  |  |  |  |  | (53) | 10 | 131
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | 221 | 274 | (131)
Valuation changes on embedded derivatives that are not hedged, after-tax |  |  |  |  |  |  |  |  | (2) | (6) | 3
Premium deficiency for immediate annuities, after tax |  |  |  |  |  |  |  |  | (178) | 0 | 0
Gain on disposition of operations, after-tax |  |  |  |  |  |  |  |  | 3 | 4 | 4
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 69
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (9) | 282 | 76
Allstate Annuities | Reinsurance ceded |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premium deficiency for immediate annuities, after tax |  | $ 225 |  |  |  |  |  |  |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 47 | 70 | 71
Adjusted net income |  |  |  |  |  |  |  |  | (428) | (438) | (406)
Realized capital gains (losses), after-tax |  |  |  |  |  |  |  |  | 47 | 19 | (30)
Pension and other postretirement remeasurement gains (losses), after-tax |  |  |  |  |  |  |  |  | 39 | (90) | (370)
Curtailment gain, after-tax |  |  |  |  |  |  |  |  | 7 | 0 | 0
Business combination expenses, after-tax |  |  |  |  |  |  |  |  | 0 | 0 | (7)
Tax Legislation expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | (15)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | $ (335) | $ (509) | $ (828)

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