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Reportable Segments - Schedule of Reportable Segments Financial Performance (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information |  |
Allstate Protection and Run-off Property-Liability net investment income | $ 764 | $ 575
Net gains (losses) on investments and derivatives | (164) | 14
Pension and other postretirement remeasurement gains (losses) | 2 | 53
Amortization of purchased intangibles | (69) | (81)
Less: Net loss attributable to noncontrolling interest | (20) | (1)
Net income (loss) applicable to common shareholders, basic | 1,189 | (346)
Net income (loss) applicable to common shareholders, diluted | 1,189 | (346)
Segment Reconciling Items |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 267 | 653
Net gains (losses) on investments and derivatives | (164) | 14
Pension and other postretirement remeasurement gains (losses) | 2 | 53
Amortization of purchased intangibles | (18) | (24)
Gain (loss) on disposition | 4 | 9
Income tax (expense) benefit on reconciling items | (259) | 92
Property-Liability |  |
Segment Reporting Information |  |
Less: Net loss attributable to noncontrolling interest | (20) | (1)
Property-Liability | Operating Segments |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | 898 | (1,001)
Allstate Protection and Run-off Property-Liability net investment income | 702 | 509
Net gains (losses) on investments and derivatives | (162) | 12
Property-Liability | Operating Segments | Allstate Protection |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | 903 | (998)
Property-Liability | Operating Segments | Run-off Property-Liability |  |
Segment Reporting Information |  |
Underwriting income (loss) by segment | (5) | (3)
Property-Liability | Segment Reconciling Items |  |
Segment Reporting Information |  |
Allstate Protection and Run-off Property-Liability net investment income | 702 | 509
Protection Services | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 54 | 34
Allstate Protection and Run-off Property-Liability net investment income | 21 | 16
Net gains (losses) on investments and derivatives | (5) | (1)
Allstate Health and Benefits | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | 56 | 56
Allstate Protection and Run-off Property-Liability net investment income | 23 | 19
Net gains (losses) on investments and derivatives | 2 | 2
Corporate and Other | Operating Segments |  |
Segment Reporting Information |  |
Adjusted net income (loss) by segment, after-tax | (106) | (89)
Allstate Protection and Run-off Property-Liability net investment income | 18 | 31
Net gains (losses) on investments and derivatives | $ 1 | $ 1

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