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Reportable Segments - Financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information |  |  |  |
Adjusted net income | $ 970 | $ 234 | $ 1,701 | $ (267)
Net investment income | 974 | 220 | 1,682 | 466
Realized capital gains (losses) | 287 | 440 | 713 | 278
Pension and other postretirement remeasurement gains (losses) | 134 | (73) | 444 | (391)
Business combination expense and amortization of purchased intangibles | (34) | (26) | (90) | (53)
Business combination fair value adjustment | 6 | 0 | 6 | 0
Income tax expense | (354) | (285) | (976) | (481)
Income (loss) from discontinued operations | 493 | 167 | (3,670) | (203)
Income tax (expense) benefit from discontinued operations | (297) | (23) | 73 | 59
Income (loss) from discontinued operations, net of tax | 196 | 144 | (3,597) | (144)
Less: Net income attributable to noncontrolling interest | 6 | 0 | 0 | 0
Net income applicable to common shareholders | 1,595 | 1,224 | 187 | 1,737
Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | 431 | 905 | 2,091 | 2,256
Run-off Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) | (2) | (3) | (5) | (6)
Protection Services |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income | 56 | 38 | 105 | 75
Allstate Health and Benefits |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income | 62 | 5 | 127 | 29
Net investment income | 19 | 20 | 38 | 40
Realized capital gains (losses) | 4 | 11 | 6 | (3)
Corporate and Other |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income | (112) | (99) | (235) | (206)
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 931 | 178 | 1,604 | 380
Realized capital gains (losses) | $ 265 | $ 382 | $ 669 | $ 279

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