v3.26.3
Reportable Segments - Schedule of Reportable Segments Financial Performance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income $ 1,177 $ 949 $ 3,124 $ 2,557
Net gains (losses) on investments and derivatives (545) 252 105 (241)
Pension and other postretirement remeasurement gains (losses) 28 108 155 30
Amortization of purchased intangibles (46) (59) (139) (175)
Gain on disposition of operations 0 720 0 1,610
Less: Net income (loss) attributable to noncontrolling interest 1 (2) 2 (11)
Net income applicable to common shareholders, basic 2,050 3,717 7,719 6,362
Net income applicable to common shareholders, diluted 2,050 3,717 7,719 6,362
Allstate Protection        
Segment Reporting        
Less: Net income (loss) attributable to noncontrolling interest 1 (1) 3 (10)
Operating segments        
Segment Reporting        
Amortization of purchased intangibles (46) (59) (139) (175)
Operating segments | Allstate Protection        
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income 1,052 873 2,782 2,343
Net gains (losses) on investments and derivatives (471) 157 200 (362)
Operating segments | Allstate Protection | Allstate Protection        
Segment Reporting        
Underwriting income (loss) by segment 2,240 3,040 6,905 4,687
Amortization of purchased intangibles (38) (46) (115) (138)
Operating segments | Allstate Protection | Run-off Property-Liability        
Segment Reporting        
Underwriting income (loss) by segment (218) (146) (219) (153)
Operating segments | Protection Services        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 64 46 164 161
Allstate Protection and Run-off Property-Liability net investment income 27 25 75 74
Net gains (losses) on investments and derivatives (18) 10 1 1
Amortization of purchased intangibles (6) (10) (18) (28)
Operating segments | Allstate Health and Benefits        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 0 0 0 43
Allstate Protection and Run-off Property-Liability net investment income 0 0 0 24
Net gains (losses) on investments and derivatives 0 0 0 (1)
Amortization of purchased intangibles 0 0 0 (1)
Operating segments | Corporate        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax (43) (87) (150) (278)
Allstate Protection and Run-off Property-Liability net investment income 96 49 260 108
Net gains (losses) on investments and derivatives (54) 85 (93) 122
All other        
Segment Reporting        
Adjusted net income (loss) by segment, after-tax 8 863 1,022 1,892
Net gains (losses) on investments and derivatives (545) 252 105 (241)
Pension and other postretirement remeasurement gains (losses) 28 108 155 30
Amortization of purchased intangibles (8) (13) (24) (37)
Gain on disposition of operations (1) 723 6 1,616
All other 4 (7) 21 (16)
Income tax (expense) benefit on Allstate Protection and Run-off Property-Liability and reconciling items (522) (1,073) (2,023) (1,803)
All other | Allstate Protection        
Segment Reporting        
Allstate Protection and Run-off Property-Liability net investment income $ 1,052 $ 873 $ 2,782 $ 2,343