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Reportable Segments - Schedule of Reportable Segments Financial Performance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information |  |  |  |
Allstate Protection and Run-off Property-Liability net investment income | $ 783 | $ 689 | $ 2,259 | $ 1,874
Net gains (losses) on investments and derivatives | 243 | (86) | (24) | (223)
Pension and other postretirement remeasurement gains (losses) | (26) | (149) | (15) | (56)
Amortization of purchased intangibles | (71) | (83) | (210) | (246)
Less: Net (loss) income attributable to noncontrolling interest | (26) | 1 | (30) | (23)
Net income (loss) applicable to common shareholders, basic | 1,161 | (41) | 2,651 | (1,776)
Net income (loss) applicable to common shareholders, diluted | 1,161 | (41) | 2,651 | (1,776)
Segment Reconciling Items |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 656 | 389 | 1,376 | 1,737
Net gains (losses) on investments and derivatives | 243 | (86) | (24) | (223)
Pension and other postretirement remeasurement gains (losses) | (26) | (149) | (15) | (56)
Amortization of purchased intangibles | (19) | (23) | (56) | (71)
Gain (loss) on disposition | 1 | (5) | 6 | (4)
Non-recurring costs | 0 | 0 | 0 | (90)
Income tax (expense) benefit on Property-Liability and reconciling items | (251) | 25 | (588) | 501
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Less: Net (loss) income attributable to noncontrolling interest | (25) | 2 | (29) | (22)
Property-Liability | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | 495 | (414) | 1,248 | (3,509)
Allstate Protection and Run-off Property-Liability net investment income | 708 | 627 | 2,053 | 1,680
Net gains (losses) on investments and derivatives | 222 | (62) | (43) | (185)
Property-Liability | Operating Segments | Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | 555 | (331) | 1,316 | (3,421)
Property-Liability | Operating Segments | Run-off Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | (60) | (83) | (68) | (88)
Property-Liability | Segment Reconciling Items |  |  |  |
Segment Reporting Information |  |  |  |
Allstate Protection and Run-off Property-Liability net investment income | 708 | 627 | 2,053 | 1,680
Protection Services | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 58 | 27 | 167 | 102
Allstate Protection and Run-off Property-Liability net investment income | 24 | 19 | 68 | 53
Net gains (losses) on investments and derivatives | 10 | (8) | 4 | (13)
Allstate Health and Benefits | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 37 | 69 | 151 | 182
Allstate Protection and Run-off Property-Liability net investment income | 26 | 20 | 74 | 60
Net gains (losses) on investments and derivatives | (6) | (2) | (4) | 1
Corporate and Other | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | (110) | (110) | (320) | (310)
Allstate Protection and Run-off Property-Liability net investment income | 25 | 23 | 64 | 81
Net gains (losses) on investments and derivatives | $ 17 | $ (14) | $ 19 | $ (26)

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