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Reportable Segments - Financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information |  |  |  |
Net investment income | $ 832 | $ 880 | $ 1,662 | $ 2,470
Net income applicable to common shareholders | 1,126 | 889 | 2,863 | 2,971
Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | 888 | 836 | 3,143 | 1,909
Discontinued Lines and Coverages |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | (135) | (99) | (141) | (105)
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | 753 | 737 | 3,002 | 1,804
Net investment income | 422 | 448 | 802 | 1,210
Income tax expense on operations | (240) | (236) | (752) | (617)
Realized capital gains (losses), after-tax | 230 | 127 | 447 | 724
Net income applicable to common shareholders | 1,165 | 1,076 | 3,499 | 3,121
Service Businesses |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 12 | 11 | 33 | 30
Realized capital gains (losses), after-tax | 11 | 4 | 7 | 17
Adjusted net income | 40 | 8 | 115 | 35
Amortization of purchased intangibles, after-tax | (21) | (25) | (63) | (74)
Impairment of purchased intangibles, after-tax | 0 | 0 | 0 | (43)
Net income applicable to common shareholders | 30 | (13) | 59 | (65)
Allstate Life |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 123 | 128 | 374 | 380
Realized capital gains (losses), after-tax | 6 | 4 | (3) | 0
Adjusted net income | (14) | 44 | 138 | 185
Valuation changes on embedded derivatives not hedged, after-tax | (1) | (9) | (24) | (9)
DAC and DSI amortization related to realized capital gains and losses, after-tax | (4) | 1 | 4 | (2)
Net income applicable to common shareholders | (13) | 40 | 115 | 174
Allstate Benefits |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 18 | 21 | 58 | 61
Realized capital gains (losses), after-tax | 3 | 2 | 0 | 7
Adjusted net income | 33 | 31 | 62 | 99
Net income applicable to common shareholders | 36 | 33 | 62 | 106
Allstate Annuities |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 245 | 251 | 358 | 737
Realized capital gains (losses), after-tax | 89 | 16 | 70 | 177
Adjusted net income | 37 | 16 | (213) | 43
Valuation changes on embedded derivatives not hedged, after-tax | 1 | (1) | (3) | (6)
Premium deficiency charge for immediate annuities, after-tax | (178) | 0 | (178) | 0
Gain on disposition of operations, after-tax | 0 | 0 | 2 | 2
Net income applicable to common shareholders | (51) | 31 | (322) | 216
Corporate and Other |  |  |  |
Segment Reporting Information |  |  |  |
Realized capital gains (losses), after-tax | 7 | 2 | 13 | 10
Adjusted net income | (111) | (101) | (317) | (302)
Pension and other postretirement remeasurement gains (losses), after-tax | 56 | (179) | (253) | (289)
Curtailment gain, after-tax | 7 | 0 | 7 | 0
Net income applicable to common shareholders | (41) | $ (278) | $ (550) | $ (581)
Life premiums | Allstate Annuities |  |  |  |
Segment Reporting Information |  |  |  |
Premium deficiency charge for immediate annuities, after-tax | $ 225 |  |  |

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