v3.25.2
Reportable Segments - Schedule of Additional Significant Financial Performance Data (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        
Amortization of DAC $ 2,076 $ 2,001 $ 4,163 $ 3,940
Amortization of purchased intangibles 57 70 116 139
Income tax expense 604 83 727 349
Operating segments        
Segment Reporting Information        
Amortization of DAC 2,076 2,001 4,163 3,940
Amortization of purchased intangibles 57 70 116 139
Income tax expense 604 83 727 349
Property-Liability | Operating segments        
Segment Reporting Information        
Amortization of DAC 1,742 1,673 3,474 3,281
Amortization of purchased intangibles 46 51 92 102
Income tax expense 350 79 498 342
Protection Services | Operating segments        
Segment Reporting Information        
Amortization of DAC 328 296 646 585
Amortization of purchased intangibles 9 13 18 24
Income tax expense 16 16 29 29
Allstate Health and Benefits | Operating segments        
Segment Reporting Information        
Amortization of DAC 6 32 43 74
Amortization of purchased intangibles 2 6 6 13
Income tax expense 247 14 255 28
Corporate and Other | Operating segments        
Segment Reporting Information        
Income tax expense $ (9) $ (26) $ (55) $ (50)