v3.26.1
Reportable Segments - Schedule of Reportable Segments Financial Performance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income $ 1,009 $ 754 $ 1,947 $ 1,608
Net gains (losses) on investments and derivatives 1,055 (144) 650 (493)
Pension and other postretirement remeasurement gains (losses) 146 0 127 (78)
Amortization of purchased intangibles (46) (57) (93) (116)
Gain on disposition of operations 0 890 0 890
Less: Net income (loss) attributable to noncontrolling interest 0 (10) 1 (9)
Net income applicable to common shareholders, basic 3,241 2,079 5,669 2,645
Net income applicable to common shareholders, diluted 3,241 2,079 5,669 2,645
Allstate Protection        
Segment Reporting        
Less: Net income (loss) attributable to noncontrolling interest 1 (10) 2 (9)
Operating segments        
Segment Reporting        
Amortization of purchased intangibles (46) (57) (93) (116)
Operating segments | Allstate Protection        
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income 885 687 1,730 1,470
Net gains (losses) on investments and derivatives 999 (190) 671 (519)
Operating segments | Allstate Protection | Allstate Protection        
Segment Reporting        
Underwriting income (loss) by segment 2,006 1,283 4,665 1,647
Amortization of purchased intangibles (38) (46) (77) (92)
Operating segments | Allstate Protection | Run-off Property-Liability        
Segment Reporting        
Underwriting income (loss) by segment 0 (3) (1) (7)
Operating segments | Protection Services        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 53 60 100 115
Allstate Protection and Run-off Property-Liability net investment income 25 25 48 49
Net gains (losses) on investments and derivatives 26 1 19 (9)
Amortization of purchased intangibles (6) (9) (12) (18)
Operating segments | Allstate Health and Benefits        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 0 9 0 43
Allstate Protection and Run-off Property-Liability net investment income 0 1 0 24
Net gains (losses) on investments and derivatives 0 (1) 0 (1)
Amortization of purchased intangibles 0 0 0 (1)
Operating segments | Corporate        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax (48) (94) (107) (191)
Allstate Protection and Run-off Property-Liability net investment income 96 37 164 59
Net gains (losses) on investments and derivatives 31 46 (39) 37
All other        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 1,231 814 1,014 1,029
Net gains (losses) on investments and derivatives 1,055 (144) 650 (493)
Pension and other postretirement remeasurement gains (losses) 146 0 127 (78)
Amortization of purchased intangibles (8) (11) (16) (24)
Gain on disposition of operations 1 893 7 893
All other 5 (5) 17 (9)
Income tax (expense) benefit on Allstate Protection and Run-off Property-Liability and reconciling items (853) (606) (1,501) (730)
All other | Allstate Protection        
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income $ 885 $ 687 $ 1,730 $ 1,470