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Variable Interest Entities - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]      
Net gains (losses) on investments and derivatives $ (168,000,000) $ (225,000,000) $ (300,000,000)
Interests in surplus notes (as a percent) 100.00%    
Insurance premiums and contract charges $ 61,449,000,000 58,309,000,000 52,516,000,000
Skyland      
Variable Interest Entity [Line Items]      
Quota share (as a percent) 100.00%    
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Net gains (losses) on investments and derivatives $ (67,000,000) (123,000,000)  
Management fee 0 24,000,000 48,000,000
Variable Interest Entity, Primary Beneficiary | Consolidation, Eliminations      
Variable Interest Entity [Line Items]      
Ceded losses incurred (1,000,000) 40,000,000 40,000,000
Variable Interest Entity, Primary Beneficiary | Allstate Protection      
Variable Interest Entity [Line Items]      
Insurance premiums and contract charges 0 199,000,000 224,000,000
Costs and expenses $ 16,000,000 $ 280,000,000 $ 251,000,000