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Reportable Segments - Financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information |  |  |  |
Net investment income | $ 844 | $ 843 | $ 2,454 | $ 2,488
Tax Legislation expense | 31 |  |  |
Net income applicable to common shareholders | 833 | 637 | 2,416 | 1,853
Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | 553 | 572 | 1,934 | 1,392
Discontinued Lines and Coverages |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | (80) | (88) | (86) | (95)
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | 473 | 484 | 1,848 | 1,297
Net investment income | 410 | 368 | 1,100 | 1,063
Income tax expense on operations | (178) | (271) | (603) | (746)
Realized capital gains and losses, after-tax | 103 | 54 | 16 | 199
Gain on disposition of operations, after-tax | 0 | 1 | 0 | 7
Tax Legislation expense | (3) | 0 | (3) | 0
Net income applicable to common shareholders | 805 | 636 | 2,358 | 1,820
Service Businesses |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) | 0 | (17) | (4) | (35)
Realized capital gains and losses, after-tax | (1) | 0 | (5) | 0
Amortization of purchased intangible assets, after-tax | (16) | (15) | (48) | (45)
Tax Legislation expense | (4) | 0 | (4) | 0
Net income applicable to common shareholders | (21) | (32) | (61) | (80)
Allstate Life |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) | 74 | 74 | 221 | 196
Realized capital gains and losses, after-tax | (3) | 1 | (7) | 2
DAC and DSI amortization related to realized capital gains and losses, after-tax | (1) | (2) | (6) | (8)
Tax Legislation expense | (16) | 0 | (16) | 0
Net income applicable to common shareholders | 54 | 73 | 192 | 190
Allstate Benefits |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) | 32 | 28 | 94 | 75
Realized capital gains and losses, after-tax | 2 | 1 | 0 | 1
Net income applicable to common shareholders | 34 | 29 | 94 | 76
Allstate Annuities |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) | 20 | 55 | 99 | 149
Realized capital gains and losses, after-tax | 40 | 11 | 22 | 6
Valuation changes on embedded derivatives not hedged, after-tax | 1 | (1) | 5 | (2)
Gain on disposition of operations, after-tax | 1 | 1 | 3 | 3
Tax Legislation expense | 69 | 0 | 69 | 0
Net income applicable to common shareholders | 131 | 66 | 198 | 156
Corporate and Other |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) | (155) | (134) | (340) | (295)
Realized capital gains and losses, after-tax | 0 | 0 | (10) | 0
Tax Legislation expense | (15) | 0 | (15) | 0
Business combination expenses, after-tax | 0 | (1) | 0 | (14)
Net income applicable to common shareholders | $ (170) | $ (135) | $ (365) | $ (309)

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