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Reportable Segments - Schedule of Reportable Segments Revenue Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information |  |
Net investment income | $ 764 | $ 575
Net gains (losses) on investments and derivatives | (164) | 14
Consolidated revenues | 15,259 | 13,786
Intersegment Eliminations |  |
Segment Reporting Information |  |
Consolidated revenues | (35) | (33)
Property-Liability | Operating Segments |  |
Segment Reporting Information |  |
Insurance premiums | 12,900 | 11,635
Other revenue | 430 | 353
Net investment income | 702 | 509
Net gains (losses) on investments and derivatives | (162) | 12
Consolidated revenues | 13,870 | 12,509
Property-Liability | Operating Segments | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 12,900 | 11,635
Property-Liability | Operating Segments | Run-off Property-Liability |  |
Segment Reporting Information |  |
Insurance premiums | 0 | 0
Property-Liability | Operating Segments | Auto | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 8,778 | 7,908
Property-Liability | Operating Segments | Homeowners | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 3,154 | 2,810
Property-Liability | Operating Segments | Other personal lines | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 659 | 562
Property-Liability | Operating Segments | Commercial lines | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 169 | 232
Property-Liability | Operating Segments | Other business lines | Allstate Protection |  |
Segment Reporting Information |  |
Insurance premiums | 140 | 123
Protection Services | Operating Segments |  |
Segment Reporting Information |  |
Other revenue | 85 | 84
Net investment income | 21 | 16
Net gains (losses) on investments and derivatives | (5) | (1)
Intersegment premiums and service fees | 35 | 33
Consolidated revenues | 748 | 670
Protection Services | Operating Segments | Protection plans |  |
Segment Reporting Information |  |
Other revenue | 439 | 361
Protection Services | Operating Segments | Roadside assistance |  |
Segment Reporting Information |  |
Other revenue | 47 | 49
Protection Services | Operating Segments | Protection and insurance products |  |
Segment Reporting Information |  |
Other revenue | 126 | 128
Allstate Health and Benefits | Operating Segments |  |
Segment Reporting Information |  |
Other revenue | 134 | 101
Net investment income | 23 | 19
Net gains (losses) on investments and derivatives | 2 | 2
Consolidated revenues | 637 | 585
Allstate Health and Benefits | Operating Segments | Employer voluntary benefits |  |
Segment Reporting Information |  |
Other revenue | 248 | 255
Allstate Health and Benefits | Operating Segments | Group health |  |
Segment Reporting Information |  |
Other revenue | 118 | 107
Allstate Health and Benefits | Operating Segments | Individual health |  |
Segment Reporting Information |  |
Other revenue | 112 | 101
Corporate and Other | Operating Segments |  |
Segment Reporting Information |  |
Other revenue | 20 | 23
Net investment income | 18 | 31
Net gains (losses) on investments and derivatives | 1 | 1
Consolidated revenues | $ 39 | $ 55

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