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Reportable Segments - Schedule of Reportable Segments Expense Information Used in Measure for Segment Profit or Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information      
Prior year reserve reestimates $ (1,809) $ (308) $ 549
Amortization of DAC 8,389 8,039 7,278
Amortization of purchased intangibles 231 280 329
Interest expense 399 400 379
Restructuring and related charges 61 61 169
Income taxes on operations 2,890 1,162 (135)
Preferred stock dividends 117 117 128
Non-catastrophe losses      
Segment Reporting Information      
Prior year reserve reestimates (1,809) 62 573
Catastrophe losses      
Segment Reporting Information      
Prior year reserve reestimates 0 (370) (24)
Loss adjustment expenses, net of reinsurance 4,960 4,960 5,640
Operating segments | Allstate Protection | Allstate Protection      
Segment Reporting Information      
Claims and claims expense 33,628 34,092 34,243
Amortization of DAC 7,003 6,676 6,070
Advertising expense 2,100 1,863 638
Amortization of purchased intangibles 183 206 235
Restructuring and related charges 54 51 142
Other segment expenses 5,073 4,762 4,613
Total 51,039 52,608 52,062
Loss adjustment expenses, net of reinsurance 2,980 2,890 2,790
Operating segments | Allstate Protection | Allstate Protection | Non-catastrophe losses      
Segment Reporting Information      
Prior year reserve reestimates (1,961) (6) 485
Operating segments | Allstate Protection | Allstate Protection | Catastrophe losses      
Segment Reporting Information      
Prior year reserve reestimates 4,959 4,964 5,636
Operating segments | Allstate Protection | Run-off Property-Liability      
Segment Reporting Information      
Claims and claims expense 151 68 89
Other segment expenses 3 5 5
Total 154 73 94
Loss adjustment expenses, net of reinsurance 28 9 10
Operating segments | Protection Services      
Segment Reporting Information      
Claims and claims expense 699 641 632
Amortization of DAC 1,328 1,217 1,058
Non-deferrable commissions 447 343 249
Restructuring and related charges 4 2 6
Other segment expenses 786 747 640
Income taxes on operations 65 71 83
Total 3,329 3,021 2,668
Operating segments | Allstate Health and Benefits      
Segment Reporting Information      
Amortization of DAC 30 119 124
Accident, health and other policy benefits 379 991 888
Restructuring and related charges 0 2 6
Other segment expenses 213 577 549
Income taxes on operations 12 42 53
Total 634 1,731 1,620
Operating segments | Corporate      
Segment Reporting Information      
Interest expense 399 400 379
Restructuring and related charges 1 5 13
Other segment expenses 160 163 185
Income taxes on operations (74) (99) (99)
Preferred stock dividends 117 117 128
Total $ 603 $ 586 $ 606