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Reportable Segments - Schedule of Reportable Segment Total Assets, Investments and Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information        
Assets $ 119,758 $ 111,617    
Investments 83,237 72,610    
Deferred policy acquisition costs 6,163 5,773 $ 5,940 $ 5,442
Investments held for sale 1,114 824    
All other        
Segment Reporting Information        
Deferred policy acquisition costs 86 63 $ 43  
All other        
Segment Reporting Information        
Assets 975 648    
Investments 200 160    
Allstate Protection | Operating segments        
Segment Reporting Information        
Assets 102,801 96,988    
Investments 73,222 67,671    
Allstate Protection | Operating segments | Allstate Protection        
Segment Reporting Information        
Deferred policy acquisition costs 2,803 2,548    
Protection Services | Operating segments        
Segment Reporting Information        
Assets 8,372 7,540    
Investments 2,312 2,228    
Deferred policy acquisition costs 3,274 3,161    
Allstate Health and Benefits | Operating segments        
Segment Reporting Information        
Assets 0 3,714    
Investments 0 219    
Deferred policy acquisition costs 0 1    
Allstate Health and Benefits | Disposal Group, Held-for-Sale, Not Discontinued Operations        
Segment Reporting Information        
Investments held for sale   1,910    
Deferred policy acquisition costs   521    
Corporate | Operating segments        
Segment Reporting Information        
Assets 7,610 2,727    
Investments $ 7,503 $ 2,332