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Reportable Segments - Schedule of Reportable Segments Financial Performance (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information |  |  |  |
Net investment income | $ 754 | $ 712 | $ 1,608 | $ 1,476
Net gains (losses) on investments and derivatives | (144) | (103) | (493) | (267)
Pension and other postretirement remeasurement gains (losses) | 0 | 9 | (78) | 11
Amortization of purchased intangibles | (57) | (70) | (116) | (139)
Gain (loss) on disposition | 890 | 0 | 890 | 0
Less: Net (loss) income attributable to noncontrolling interest | (10) | 16 | (9) | (4)
Net income applicable to common shareholders, basic | 2,079 | 301 | 2,645 | 1,490
Net income applicable to common shareholders, diluted | 2,079 | 301 | 2,645 | 1,490
Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Amortization of purchased intangibles | (57) | (70) | (116) | (139)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 819 | 453 | 1,038 | 720
Net gains (losses) on investments and derivatives | (144) | (103) | (493) | (267)
Pension and other postretirement remeasurement gains (losses) | 0 | 9 | (78) | 11
Amortization of purchased intangibles | (11) | (19) | (24) | (37)
Gain (loss) on disposition | 893 | 1 | 893 | 5
Income tax (expense) benefit on Property-Liability and reconciling items | (606) | (78) | (730) | (337)
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Less: Net (loss) income attributable to noncontrolling interest | (10) | 16 | (9) | (4)
Property-Liability | Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | 1,280 | (145) | 1,640 | 753
Net investment income | 687 | 643 | 1,470 | 1,345
Net gains (losses) on investments and derivatives | (190) | (103) | (519) | (265)
Amortization of purchased intangibles | (46) | (51) | (92) | (102)
Property-Liability | Operating segments | Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | 1,283 | (142) | 1,647 | 761
Property-Liability | Operating segments | Run-off Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Underwriting income (loss) by segment | (3) | (3) | (7) | (8)
Property-Liability | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 687 | 643 | 1,470 | 1,345
Protection Services | Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 60 | 55 | 115 | 109
Net investment income | 25 | 23 | 49 | 44
Net gains (losses) on investments and derivatives | 1 | (1) | (9) | (6)
Amortization of purchased intangibles | (9) | (13) | (18) | (24)
Allstate Health and Benefits | Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | 4 | 58 | 34 | 114
Net investment income | 5 | 25 | 30 | 48
Net gains (losses) on investments and derivatives | (1) | 0 | (2) | 2
Amortization of purchased intangibles | (2) | (6) | (6) | (13)
Corporate and Other | Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Adjusted net income (loss) by segment, after-tax | (94) | (104) | (191) | (210)
Net investment income | 37 | 21 | 59 | 39
Net gains (losses) on investments and derivatives | $ 46 | $ 1 | $ 37 | $ 2

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