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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Prior Year Reserve Reestimates Included in Claims and Claims Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Increase (decrease) in claims and claims expense      
Prior years $ (1,809) $ (308) $ 549
Auto      
Increase (decrease) in claims and claims expense      
Prior years (1,880) (364) 244
Homeowners      
Increase (decrease) in claims and claims expense      
Prior years (16) (395) 102
Other personal lines      
Increase (decrease) in claims and claims expense      
Prior years 128 217 19
Commercial lines      
Increase (decrease) in claims and claims expense      
Prior years (148) 166 84
Other business lines      
Increase (decrease) in claims and claims expense      
Prior years (45) 0 12
Run-off Property-Liability      
Increase (decrease) in claims and claims expense      
Prior years 151 68 89
Protection Services      
Increase (decrease) in claims and claims expense      
Prior years 1 0 (1)
Catastrophe losses      
Increase (decrease) in claims and claims expense      
Prior years 0 (370) (24)
Catastrophe losses | Auto      
Increase (decrease) in claims and claims expense      
Prior years (28) (36) (50)
Catastrophe losses | Homeowners      
Increase (decrease) in claims and claims expense      
Prior years 43 (322) 36
Catastrophe losses | Other personal lines      
Increase (decrease) in claims and claims expense      
Prior years (14) (7) (18)
Catastrophe losses | Commercial lines      
Increase (decrease) in claims and claims expense      
Prior years (1) (5) 8
Catastrophe losses | Other business lines      
Increase (decrease) in claims and claims expense      
Prior years 0 0 0
Catastrophe losses | Run-off Property-Liability      
Increase (decrease) in claims and claims expense      
Prior years 0 0 0
Catastrophe losses | Protection Services      
Increase (decrease) in claims and claims expense      
Prior years 0 0 0
Nationwide Reinsurance Program      
Increase (decrease) in claims and claims expense      
Prior years 60    
2021 Colorado Marshall Fire      
Increase (decrease) in claims and claims expense      
Prior years 54    
Non-catastrophe losses      
Increase (decrease) in claims and claims expense      
Prior years (1,809) 62 573
Non-catastrophe losses | Auto      
Increase (decrease) in claims and claims expense      
Prior years (1,852) (328) 294
Non-catastrophe losses | Homeowners      
Increase (decrease) in claims and claims expense      
Prior years (59) (73) 66
Non-catastrophe losses | Other personal lines      
Increase (decrease) in claims and claims expense      
Prior years 142 224 37
Non-catastrophe losses | Commercial lines      
Increase (decrease) in claims and claims expense      
Prior years (147) 171 76
Non-catastrophe losses | Other business lines      
Increase (decrease) in claims and claims expense      
Prior years (45) 0 12
Non-catastrophe losses | Run-off Property-Liability      
Increase (decrease) in claims and claims expense      
Prior years 151 68 89
Non-catastrophe losses | Protection Services      
Increase (decrease) in claims and claims expense      
Prior years 1 0 (1)
Favorable Severity Development | Personal Auto Injury Coverage      
Increase (decrease) in claims and claims expense      
Prior years 1,180    
Favorable Severity Development | Personal Auto Physical Damage Coverage      
Increase (decrease) in claims and claims expense      
Prior years 671    
Annual Reserve Review | Run-off Property-Liability      
Increase (decrease) in claims and claims expense      
Prior years $ 146 $ 58 $ 80