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Reportable Segments - Financial performance (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information |  |
Property-Liability net investment income | $ 575 | $ 594
Net gains (losses) on investments and derivatives | 14 | (267)
Pension and other postretirement remeasurement gains (losses) | 53 | 247
Amortization of purchased intangibles | (81) | (87)
Less: Net income (loss) attributable to noncontrolling interest | (1) | (10)
Net (loss) income applicable to common shareholders, Basic | (346) | 634
Segment Reconciling Items |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 653 | 345
Net gains (losses) on investments and derivatives | 14 | (267)
Pension and other postretirement remeasurement gains (losses) | 53 | 247
Amortization of purchased intangibles | (24) | (29)
Gain (loss) on disposition | 9 | (16)
Income tax benefit (expense) on reconciling items | 92 | (148)
Allstate Protection | Operating Segments |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | (998) | 282
Run-off Property-Liability | Operating Segments |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | (3) | (2)
Property-Liability |  |
Segment Reporting Information |  |
Property-Liability net investment income | 509 | 558
Net gains (losses) on investments and derivatives | 12 | (203)
Less: Net income (loss) attributable to noncontrolling interest | (1) | (10)
Property-Liability | Operating Segments |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | (1,001) | 280
Property-Liability | Segment Reconciling Items |  |
Segment Reporting Information |  |
Property-Liability net investment income | 509 | 558
Protection Services | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 34 | 53
Allstate Health and Benefits |  |
Segment Reporting Information |  |
Property-Liability net investment income | 19 | 17
Net gains (losses) on investments and derivatives | 2 | (7)
Allstate Health and Benefits | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 56 | 57
Corporate and Other | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | (89) | (111)
Property-Liability net investment income | 31 | 10
Net gains (losses) on investments and derivatives | $ 1 | $ (44)

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