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Reportable Segments - Financial performance (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information |  |
Adjusted net income | $ 731 | $ (501)
Net investment income | 708 | 246
Realized capital gains (losses) | 426 | (162)
Pension and other postretirement remeasurement (gains) losses | (310) | 318
Business combination expenses and amortization of purchased intangibles | (56) | (27)
Income tax expense | (622) | (196)
Loss from discontinued operations | (4,163) | (370)
Income tax benefit from discontinued operations | (370) | (82)
Loss from discontinued operations, net of tax | (3,793) | (288)
Less: Net loss attributable to noncontrolling interest | (6) | 0
Net (loss) income applicable to common shareholders | (1,408) | 513
Allstate Protection |  |
Segment Reporting Information |  |
Underwriting income (loss) | 1,660 | 1,351
Run-off Property-Liability |  |
Segment Reporting Information |  |
Underwriting income (loss) | (3) | (3)
Protection Services |  |
Segment Reporting Information |  |
Adjusted net income | 49 | 37
Allstate Health and Benefits |  |
Segment Reporting Information |  |
Adjusted net income | 65 | 24
Net investment income | 19 | 20
Realized capital gains (losses) | 2 | (14)
Corporate and Other |  |
Segment Reporting Information |  |
Adjusted net income | (123) | (107)
Property-Liability |  |
Segment Reporting Information |  |
Net investment income | 673 | 202
Realized capital gains (losses) | $ 404 | $ (103)

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