v3.25.2
Reportable Segments - Schedule of Reportable Segments Expense Information Used in Measure for Segment Profit or Loss (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        
Prior year reserve reestimates $ (370) $ (203) $ (621) $ (354)
Accident, health and other policy benefits 188 291 521 587
Amortization of DAC 2,076 2,001 4,163 3,940
Amortization of purchased intangibles 57 70 116 139
Interest expense 100 98 200 195
Restructuring and related charges 15 13 31 23
Income taxes on operations 604 83 727 349
Preferred stock dividends 30 30 59 59
Non-catastrophe losses        
Segment Reporting Information        
Prior year reserve reestimates (376) (65) (611) (54)
Catastrophe        
Segment Reporting Information        
Prior year reserve reestimates 6 (138) (10) (300)
Loss adjustment expenses, net of reinsurance     4,190 2,850
Operating segments | Property-Liability        
Segment Reporting Information        
Total 13,570 13,925 27,725 26,357
Loss adjustment expenses, net of reinsurance 751 713 1,490 1,410
Operating segments | Property-Liability | Allstate Protection        
Segment Reporting Information        
Property and casualty insurance claims and claims expense 8,470 8,593 17,163 17,200
Amortization of DAC 1,742 1,673 3,474 3,281
Advertising expense 442 402 965 685
Amortization of purchased intangibles 46 51 92 102
Restructuring and related charges 13 15 29 22
Other segment expenses 1,242 1,134 2,419 2,267
Total 13,567 13,922 27,718 26,349
Operating segments | Property-Liability | Allstate Protection | Non-catastrophe losses        
Segment Reporting Information        
Prior year reserve reestimates (378) (66) (616) (59)
Operating segments | Property-Liability | Allstate Protection | Catastrophe        
Segment Reporting Information        
Property and casualty insurance claims and claims expense 1,990 2,120 4,192 2,851
Operating segments | Property-Liability | Run-off Property-Liability        
Segment Reporting Information        
Property and casualty insurance claims and claims expense 2 2 5 6
Other segment expenses 1 1 2 2
Total 3 3 7 8
Operating segments | Protection Services        
Segment Reporting Information        
Property and casualty insurance claims and claims expense 170 157 331 315
Amortization of DAC 328 296 646 585
Restructuring and related charges 1 0 1 1
Other segment expenses 290 246 599 480
Income taxes on operations 18 19 35 36
Total 807 718 1,612 1,417
Operating segments | Allstate Health and Benefits        
Segment Reporting Information        
Accident, health and other policy benefits 188 291 521 587
Amortization of DAC 6 32 43 74
Restructuring and related charges 1 0 1 1
Other segment expenses 149 224 383 449
Income taxes on operations 1 15 10 30
Total 345 562 958 1,141
Operating segments | Corporate and Other        
Segment Reporting Information        
Interest expense 100 98 200 195
Restructuring and related charges 0 (2) 0 (1)
Other segment expenses 45 47 77 89
Income taxes on operations (21) (29) (48) (54)
Preferred stock dividends 30 30 59 59
Total $ 154 $ 144 $ 288 $ 288